Femmit, what do you think about women photoshopping pictures of themselves?

In this post someone posted a picture of herself wearing a really nice dress that she made herself.

The top comments were about the fact that she photoshopped it, apparently to make herself look thinner.

I thought it was mean to point out it was an altered photo - she's obviously pretty regardless and her dress is amazing! But on the other hand, this is the kind of photomanipulation that people (probably rightly) criticize in magazines. Would it be best for us all to refrain from photoshopping our own images?