Even "angels" of Victoria's Secret do it! Khosk Elsa got on a photoshop
Even not against it is even better for model to make the ideal bodies. However, not each of them is capable to master a photoshop as the pro. The other day Insta-pablik @celebface (which exposes celebrities) published a collage of pictures Khosk Elsa (30). And the difference is obvious: on a photo which the model posted at itself in a profile, it "corrected" shoulders, hands and a waist...