Hi,
I just have tested your program.
First problem which I had was color of skin. When I added genitals, so their color is different than the skin of the body. Also you could add function change type, size and shape of nipples.
I would like to see a feature to set every eye separately and the eyebrows too. Eyebrows are yet more different than eyes because they say much more about the models character and feelings. I believe there is just few people who are wearing symmetrical eyebrows. According my observations I see ppl having different size, length, and shape of the left and right eyebrow. In fact, I believe that this make ppl looking much more beautiful. If you have a model with perfectly symmetrical eyebrows, that it ugly! Not nice! If a scientist would create a robot with a face which eyebrows are perfectly symmetrical, it will not look really like human because you will feel something strange in his expression in his/her face.
The weight macro can change how much of fat the model has, but it is not realistic to have slim person, which ribs are not visible. There would be a need for a skeleton. I believe that it is not possible to get high quality and realistic model without skeleton. And you model, unfortunately does not look realistic, because when you discrease level of fat, you don't see any bones! So maybe you should start to create skeletons and then to make some way how to change the shape of the surface of the body according of the selected skeleton. There are three levels what to think about. Skeleton structure, muscles structure and mass of fat. This all can change the look dramatically. You could also add a cellulitide for a skin, especially on buttocks.
Conclusion. The model is not much worked in details. It would be nice to see realistic shapes of muscles just like every normal human has. I would like to see nice shaped deltoids, triceps or even neck in much higher details. I know it would be much of work, but would it be possible to make the body in certain position? Then it could be more fun.