you still got a long ways to go. But its ok for a start.
Best one IMO is the Sakura kaede one(although i hate kampfer for being such a stupid anime). If i was to suggest something it would be to not put red on the breast, It makes no sense and looks bad.
There are tons of flaws/stuff i could point out on each one, but you probably already know that.
Mostly just keep trying. Your about the flash(newgrounds) level atm, keep working at it and study others. Oh, and look at the original characters b4 too as well as making better poses.