This is a photoshop - signed, a graphic artist. (with pics)

Someone asked about this photo from H&M featuring their plus sized model
The suit does a good job of puling her handles in but along the suit they did smooth it out further. theres no indent along the left side. The breast on the left, the shadow over her arm is unrealistic and that is a pretty sharp line under her breast along her rib cage too.

But I have to give them a lot of credit. As a GA I personally would have evened out the shadow off her right shoulder or darkened her skin where its very bright. It doesn't make her more or less attractive - it but it is a distraction from where you want your eye to go.
Her breasts are a little big and awkward for this angle, I would have been tempted to edit them myself to flatter the product better, but they didn't. they didn't draw in cleavage, they didn't lift them, shrink them, or anything,
I'm very proud of them for leaving her curves mostly in tact, along her legs you see those funny lumps we have, as well as the armpit bulges. There is the usual color enhancing but you're going to get that anywhere. I'm really impressed with this really,