Yeah, i'll agree with you on that. Seriously, I think it all depends on the frame of the person as well as there muscle mass and body fat, but I have photos of me in the same positions and when resized, still look much thinner than all the 100 lb -ers.
I love seeing things like this, but after seeing the 5'10 140lb girl, I am not sure I want to be that skinny in the chest and butt areas! But I guess I will stop losing weight when I feel like I look good!