Originally Posted by
Thi3f
You need to work on your poses and anatomy, in the first two the characters are out of balance, and would fall over, if they're moving you need to think about line of action to make the image pop with a sense of motion, and the shading is off in pretty much all of those. It helps alot to imagine, or even sketch out, where the light is coming from.
Don't take this as mean comments, I mean it as constructive criticism. All of what I described can be found in most art teaching literature.
Also I would suggest learning how to draw real people before caricaturing them with a style such as the one in anime.
That's my two cents.