I've decided on a style for the comic, and a look for the girls, and we've come up with a working title for the comic until we can come up with something better.
This here is a size comparison of the final design of Olga and Douceline in everyday street clothes for the both of them.
Olga's shoulders are intentionally that wide. She's a seven foot tall gymnast. That means she's going to have large shoulders to handle her weight while doing floor exercises and the like. Her hips are also the way they are so her thighs don't rub. I want her to be good at sneaking around. Her waist is slimmer than it looks at least. Her shirt is just hanging so loose it hides that fact.
Olga is a big girl, and Douceline is a fairly average sized one.

Douceline is copyright me, Talbotlynx.
Olga and 'Looming Cuties' is a shared ownership.