I don't want to say that there is anything particularly wrong with your art. You could work on your technical skill, like every other artist, more but that is not the reason why you're not getting the recognition you want on Instagram. There are plenty of artists with your abilities that fair very similar, no matter how beautiful or appealing the actual artwork may be. It just takes time and dedication, eventually those numbers will rise because you have built up a repertoire of beautiful pieces. Don't worry, a lot of luck is involved too.
For me, colors at the first two pictures look a bit too bright and too pink (but take into account that I personally don't like bright colors in general, so I'm biased about it). Also the girl on the first picture has a bit weird proportions.
Besides this, I don't know what else to say about quality of art itself. It's hard to criticise it, because it's good, as other commenters already noticed.
So, if it's good, then why people don't pay much attention to it?
- Well, first of all, I agree with people, who say that it's because of high competition. There are a lot of artists in the Instagram, so it's very hard to stand out!
- Secondly, people pay the most attention to art with strikingly funny things, or to art which is made in some very original way, or to art of exceptional quality etc. - to things which are exceptional and immediately catch attention for one reason or another.
- There is always a factor of luck. And of marketing, of course.
Besides, I'd recommend you to look at Instagram accounts of artists you like, which are popular and analyse, what are the key differences between your account and theirs.
Hope this was helpful... honestly, I'm far from being popular as well, so take it with the gram of salt! 
I don't think there is anything really wrong with it. It takes time i guess. I'm not good with instagram so i don't really get how it works. Recently i promoted a facebook post (it also gets promoted on instagram) and got like 50 new instagram followers in like 3 or 4 days from that (not so much on facebook) So maybe you can do that, i suspect more people are do it but they don't admit it.
um I don't know about instagram but if you want feedback on the drawings then here's what I see at first glance:
Personally for me it feels like the poses are a bit stiff/uncomfortable and the faces look almost the same like same eyes same mouth and noses same face structure, also the filter on them makes the whole piece flat. Not saying they aren't good just pointing out some shortcomings I personally see
the idea is good (tropical fruit girls and all that, very cool and simple) but what is missing (Or at least for me personally) is a story in the pieces, give the pieces life or story and most people will get hooked easier, I fin. It could be something simple like them playing with the fruit a game like volley-ball or they are on the beach with a banana chair and ice cream falling on them ruining the day, things like these greatly increase the art from just a pin up of a girl to something more engaging.
or at least that's what I think
Your art is great! Instagram is difficult to grow on as a new artist. I posted a bit about how to fight is algorithm before. Maybe I should just repost it as its own thread?
Edit: ive done so, here is what i do!
Your work is nice. very vibrant colors which I personally like to implement in my own artwork. Personally I won't waist my time on instagram just for the fact that, 1. I have to post and keep up with it to gain followers, and once you aren't posting you lose the audience. secondly, I have to go out of my way to make the image sizes smaller just to accommodate the size. and on top of that, I have a full time job, I draw comics, I have a Patreon to keep up with and them I have to have a social life. so its a No no for me. honestly id rather spend more time growing my Patron page that Pays me very little than focus on Instagram that pays me nothing to have followers. won't do it. so to answer your question, your art is fine 
keep up the good work.
Im not gonna sugarcoat it. Everything is smooth and polish except the hands. If you make it look more natural, the illustration would feel much more complete.
Well if you want a critique, the facial proportions are little wonky. Should focus on lining up the eyes and having lips, nose, etc evenly sized and spaced out. Did a quick edit:
Besides that its pretty fine.
Not trying to be rude, but I think the original looks better than your edit. There's no breathing space between the eyes in your edit, and the original just looks more unique.
Totally agree. To me the edit looks like the character has also been slimmed down. To me it appears that OP intended this character to have a wider face than that edit.
I didn't notice anyone giving this critique so I'll go for it-
Trying to work around algorithms aside, there is a good chance of when/were you update VS were/when your audience checks in is in completely different time and places. Its very common that all the big sites tend to share the same general audience groups- but which ones are bigger and more active varies.
Personal example- SmackJeeves gets joked a lot for being basically a PMD site. If you write/draw a PMD comic, your best bet for your audience to find you is to upload there, regardless if you like the set up of the hosting site or not.
There is also generally spreading out and saying hello in other places. Kind of like what you are doing right now! But going to large sites like Reddit and finding the subreddits that cater to your themes is paramount. Most of my audience has found me from linking my work to reddit.
If all of that is tried and you feel algorithms are still not with you, fanart can help your audience find you. No, not just any fanart- fanart from works that have directly inspired your own personal work. People thirsty for those shared themes are always looking for more. I noticed you have some Earthbound pieces, perhaps sharing links to those pieces on various fanboards will help!
There is also the fact that said Instagram has only 20 pieces right now. That's 20 chances in a crazy large ocean for people to find you. To expect to grab a sizable audience with so few pieces is expecting the craziest amount of luck.
Wish you best, figuring out how to get your audience to find you is one of the hardest things as an artist.
I did it quickly just to give an idea what it might look like with it proportionally, the artist can take liberties with it and use it for reference not as a final drawing. It's a critique, let the artist judge for themselves. Also I don't see why im suddenly destroying the integrity of their art just cause I moved around the face slightly.
The eye spacing is fine, I put a “cyclops eye” on the original drawing to check the
proportions and it looks normal. The average spacing between two eyes is the length of one eye so it’s fine. That being said everyone has different spacings. Some have larger and some have shorter
