Did you use a photo reference for the third image? I'm just curious since it's so different in style than the rest of your work. Your other drawings have a few proportional flaws, such as too large heads or small hands but overall I think you have potential to become a good anime artist. Also, you draw cute clothes. I think the best thing you can do to improve is to observe lots of different references...from photography, art or real life. Absorb all information you can. Here's a good website to practice anatomy (WARNING! Contains nude, skinless 3D-models.):
Posemaniacs.com