I would like to know how it was decided which body each girld would have, because in my humble opinion you have Musa too flat, I think she should have a body similar to Tecna's, especially whit regard to the ass, I think she should be the one that more has of the group.
It is not to criticize your design far from It, It is just that i think that It should have a better body, especially because if you star to compare them with the others It seems that she has the body of a little girl.
I love your work, greetings from Spain (sorry if i wrote something wrong)