Find art that you like and totally steal it. This goes for any medium. So like, for examle, say I watch an anime or something and I really like the art style, I'll find an image of my favorite character and freehand a copy of it, by doing so you get a feeling for how the artist kind of did it. Then I usually draw in that sort of style for a bit with different things, maybe drawing that character in different positions and other characters, and then I take everything I like from that and incorporate that into my style. I don't even know if I'm answering your question anymore. Uh, just look everywhere for that stuff that inspires you and find that thing that makes you go "God damn I suck, I wish I was that good" and then copy the fuck out of them and eventually start making it your own. That's how I go about improving, anyway.
2 specific anime related examples I can think of that really did this for me was Akira and Serial Experiments Lain.