I agree with RinoZ, what kills your models is they're not UV mapped and textured. Your male model could probably be sold for 150/250 dollars, if it was rigged and textured. Also, I never used zbrush but your models is a sub-d one I guess: don't apply the modifier, sell a subdivision ready model. This way your customers can apply as many sub-d levels they need. If you apply the modifier odds are they'll be forced to retopologize the mode and unable to use it as it is. They say that people buy geometry mostly, so try and sell lean, light and clean geometry. In addition to this you're using max- a large user base, so make sure to include rigs, materials and lighting setups: bang for the customers' bucks. This would make your products extremely interesting. Anyway, your topology and renders look good to me. Keep it up, and sorry for the text wall.
