when you draw the froakie evolution, do the lineart and shading alongside it. it's a great way to keep on practicing. some of the linework you've done in the past is pretty good and it'd be cool if you could develop it even further. :)
i know i'm not really amazing at it, but the shading's a little weird for your beartic piece. the top area of the right arm is shaded, and so is the bottom area of the left arm. that's pretty inconsistent. when you establish colors and try to shade, you also need to establish light sources that will be consistent throughout the piece. is the light source coming from the top left? behind? i can't really explain about how to shade to you, but all i can say is take a look at examples, whether its other art or just looking at what your lamp does to objects under it at certain angles.
it's pretty much what danmire said to you a while ago: don't just go along edges of lines.
anyway, that chespin evolution looks nice. it sort of looks like a cross between a weasel, a mole, and maybe an armadillo. :o