Retouching is suddenly the fashion media's latest bugbear; it seems like every day there's another story about a model's leg being amputated or arm going missing due to errant Photoshoppery.
There's a good argument to be made for retouching. After all, modern photographic equipment is capturing detail you wouldn't see unless you were nose-to-nose with the model in question, and at that distance nobody looks good. But like Coco Rocha said, "Can you please be sure to count two arms and two legs on the girls you cut and paste?"
(n.b. This advice will work perfectly until the Paralympics. It's going to be awkward when the retouchers have to explain how they came in a couple of limbs over budget.)