Promise Tamang (aka "The Human Chamelon") is an amazingly-talented makeup artist with a huge Instagram and YouTube following.
This Mystique (X-men) tutorial is very cool, especially because Promise was so successful at recreating the scales on her face, and because the products she used are inexpensive and widely available at stores like Party City. The products she used are listed here and under her video on YouTube (see 3rd link below).
For more superhero (and super-villain) Bef-Afters, see the first two links below.
For the how-to video from Promise, see the 3rd link.
And for Promise's IG, see the last link.