Hi there. Someone who regularly posts my work on imgur and reddit here.
You may need thick skin to do it, but absolutely do keep posting there. Reddit in particular is great for generating traffic and interest, even when the post doesn't do too well in terms of upvotes.
One thing I've learned during the recent months of posting pages on the comic and webcomic subreddits is that the internet is fickle. The same exact image may do really well one day and get no interest the next. It might go viral on imgur but get downvoted on reddit, and then get posted again later with the opposite result. No matter what you post, in the long term you will get both good and bad feedback, and you'll want to stick it out through the downvotes and mean comments, as there are very few ways to get the kind of view count that imgur and reddit will get you.
Most of my posts get a few upvotes, maybe a couple nice comments, and then fade, but the effect on the site's traffic and the comic's notoriety is still invaluable. Even when the post doesn't do well, I can still see a massive spike in the session count of my site's analytics, and beyond that, I can see the numerous people who clicked, read through the entire series, and then came back later.
I've also been lucky enough to have hit most viral on imgur a couple times, and to have a couple posts do very well on reddit as well. The amount of support and new followers gained from those incidents were wonderful, and it would have never come to pass if I'd let a few downvotes or mean comments discourage me.
My stuff, imho, isn't even very good - I'm not nearly as good at drawing as other artists I've seen, and my humor is dumb and inappropriate, but it still made imgur's front page. I bring this up not to brag about a successful post, but to tell you that you CAN make the front page. It DOES happen. It never will if you let a couple failed posts discourage you from posting, though.
As others have said, you should absolutely lurk in the community to figure out how they work, what they find funny, and how to word your posts, but in the meantime do not be afraid of posting. If your work doesn't do well, it's not because you've done anything "wrong," and even if someone doesn't like it, someone else will. Of course the quality is a factor, but luck is a large factor as well.
Whoops... didn't mean for this reply to be so long. Good luck with your series! Love your art style thus far!