From an anatomy perspective, I can totally understand some of the complaints, but mostly the ones regarding posing. There are so many broken spine poses, especially in comics. They look aesthetic, but ow. Otherwise, there's nothing really wrong going on. Women exist with small waists, big tits, and wide hips. Just like they exist in large bodies with small tits.
The thing that bothers me about shit like this is that there's a double-standard going on. It's not okay to sexualize women's bodies, according to these women, but it's totally okay to turn around and sexualize men's bodies. The Wizard of Oz image upthread is actually a good example of just that. Either you can sexualize both, or you can't. You can't play either or.