Yes brown eyed girl has that right. You have to learn how to pose people. That shot could have come out a bit better, had it been posed correctly.
If you can’t make a moderately skinny girl look skinny, then imagine the shit show that will come when you have a real actual fat girl.
You really will not attract fat girls for clients by showing fat girls in your portfolio b/c fat girls are not looking at your work thinking, “wow she really made her look thinner than she was, maybe she can do that for me.”
I’m sorry that I say what everyone else is thinking, but tip toeing around the issue is just a waste of time. We are all adults here (well, some of us).