I won't take any attention about your modeling experience. But this is what i think:

You could add more polys, especially in the face. If you look at the face from a sideview it looks reeally strange
The skin is also not very well drawn. You should add real shadings, and not only black lines.
The anatomy of the bodies is also not correct in all cases.

And if you want to use them for a game, you would first have to animate them. Maybe thats why noone wants to use them.

sorry to said that, but it's fact