To be honest I wanted to write more, but I am always anxioust hat someone will start picking on what I say, so I decided to throw that one line for now. I think I'm ready to add to it now that others voiced their opinions.
Since art is always subjective, I don't know about others, but personally I am not a fan of realistic art. Especially the one that is photorealistic. It's kind of boring to me. I see real people/landscapes every day, so I'd like to look at something more cartoony from time to time. I do think it is amazing that someone can pull it off, but on the other hand, it's a lot of work that takes hours, and you could have the same result with one single click of a camera button and a filter. But as long as someone feels happy doing it, and feels acomplished after finishing a piece, I won't stop them from doing what they like to draw.
In my journey with art and making comics, I understood that I don't have to give it my best. I can work at 70 - 80 percent of my ability and still entertain people and enjoy drawing myself. Of course there's times that I put some pressure on myself or I try to challenge myself, in which I want to give it my best. And then I go back to my "relax mode" and just draw however I like until I feel like doing another challenge.
Also, you asked about master artist. Have you heard of this?
"Jack of all trades, master of none is oftentimes better than master of one."
In this situation, I think a master artist is someone who can switch between styles freely, without any trouble, than being able to work with only one style that people may get bored of quickly. My friend has an unique style, in which he draws characters in a certain "shadowy" way, and at first I was amazed, but after a while it became very repetitive. He mastered it, no doubt but you probably know that feeling when you eat something that you enjoy, but after a month you get feed up with it.
Variety is the key.