Your white balance is brilliant and clean looking. Think you're models are good, you just need lots more clips now and possibly work a little on the concept side. Also don't be afraid to move the camera a little. I dont mean any nasty pans or tilts, just genital motion. Another thing I find help sales is playing with the depth of field, Don't be scared to have a shallow depth of field.
How long have you been doing this? Sales will come, it just takes a while for the clips to find their place in the search.