Quite a lot of work! Nice to see you don't discourage easily, despite the general lack of response. You'd be well advised to stay away from high-schooler subjects, as they're apt to be underage; a particular no-no, considering the sexual intent of most of these pictures. I'll be reporting the ones here to the mods so that they can make a determination. Please don't take that personally; it's important to insure that the forum's clean from possible actionable material.
Your style needs a good deal of smoothing out, something I understand you probably already know. The feet especially could use more work, as they're the pictures' principal focus. They tend to be rather blocky and mannish... tapered, delicate, well-formed feet will increase your art's fetish appeal enormously. Otherwise, I'm happy to see you explore a variety of scenarios and points-of-view. Hang onto that spirit; with more study and practice, you'll soon be producing really pleasing, popular work!
Once again, steer clear of high-school and other underage themes. Such subject matter will likely earn you a lecture and result in having your pictures removed.