I think it would be fine to ask for photoshopping, especially if there are one or two images you really want to blow up / frame. You might offer to pay extra if you really really want it fixed.
Also, it would be annoying to ask my photog to photoshop some bunching on my dress right? It's obvious is some of the photos (not the one I posted). I wish someone had said something! I would have fixed my damn dress! It's like a big crease that makes me look fatty fat
I would ask for an edit.
A photog weighing in here - I'd expect that, if you ask for it, it will be done for the prints you order from the photog or for an album, but only if it is asked for. If you don't order prints/album, there might be a charge. I usually do 1-2 for free though if they ask.
Unfortunately, we can't know how the dress is supposed to lay and those kinds of bodices/dresses tend to have bunching, so even if we fix it in one shot, as soon as you move, it usually wrinkles again. It has to be loose enough to allow you to move.