There is no rule that the pictures you post her of yourself have to actually be pictures of yourself and any such rule would be impossible to enforce anyway. I remember years ago one member had an avatar photo that turned out to be a photo of a public figure who I was unfamiliar with.
I don't is a "face app". I do have a software program that will add eye makeup (and other makeup) and I will sometimes us it to enhance my photos, but not significantly change them.
I don't see much point in having a photo of me that isn't a photo of me.