Can Mystique replicate a person be just looking at photograph?

I have always wondered how does Mystique's transformation works.

Please spare me as I don't read many Marvel comics, just those random ones which I can get.

If Mystique has never seen a person, but gets his/her photo with only face visible (passport sized). Can she still replicate him/her? If Yes, how does she recreate the body, by her own imagination and assumption?