How do you tell? What are the main markers?
I’ve seen some posted in the funny pics thread where some fool made his right arm look bigger but forgot the left.
There was one where a girl tried to make herself look thinner but when she used whatever tool it was to alter the picture you could see she’d warped the wall surrounding her.
But I think if someone has a good computer or whatnot they can zoom in and see the technological stretch marks.
You can tell from some of the pixels and from having seen quite a few 'shops in my time.
This thread should help