I looked at these swimsuits from a buyers perspective so here it goes:
1) In the second set of photos, the model's hair distracts from the top on the Right hand side- as a buyer, I want to see the whole picture.
2) for catalog shoots, I would want to see a little more life/ light in the photos. I think putting the swimsuits against the harsh black background is kind of distracting from the fun designs and such.
3) dont worry about the models body- I commend you for going with someone that is healthy- you are targeting regular women anyways!
That isn't back fat. That crinkle in the side is just the skin when she posed. It has happened to me before when I pose too far to the side or curve my body without elongating. Pose problem, not weight problem.
The model and I have a similar bodyshape, so I'm not going to nitpick her weight. (Also, THANK YOU for making D+ swimsuits. Seriously hard to find bathing suits for my chest size.)
I agree with everyone that said the dark background is really harsh. It's almost like a school photo background? I'm also not in love with the model's pose on the top bathing suit. I can't really see the way the bathing suit "hangs" with her arms raised like that. That pose makes it difficult for me to tell if the bathing suit might be appropriate on me or not.