In fact, the first thing to do is to customize the profile in depth, depending on what you're looking for. You can even create several groups, which are the ultimate characters the game will try to reach in the end.
In the beginning, you'll ALWAYS start with hideous, alien-like girls, then you'll have to grade them as best you can, and the game will generate the girls step by step according to your grades. It's important to know that 1 is NOT the minimum grade, it's 0, so if you don't like them at all, you'll have to grade them 0, and if you like them perfectly, you'll have to grade them 10.
From what I understand from the explanations, this seems to be normal, it's the dev's intention that the game should do this.