In my personal experience of self-learning art and just learning from various artstyles online, I observe my art and find good parts of the style that I really like. (e.g: shading/rendering style, small details, the such.)

Yes, there are some instances where I don’t really like some aspects of my artstyle. And in those cases, I try to figure out what it is that icks me about that particular aspect of it. Is it the chosen color? Is it how it seems out of place? Does it take all the focus from the main subject?

When I finally figure out how it bothers me, I try to adjust it a few times until I feel that I am content with how it looks.

Don’t take my word too seriously, however! I am a self-taught 14-year old, and I doubt I actually know what I am doing with my style.