I've been working on this for... hell, I do not know how long.
Maybe I will add some light and shadows someday, but for now, I'm just done with it.
I is known that Roy Mustang burned the tattoo on Riza Hawkeye's back some time after Ishval, and I decided to draw this scene (and also to practice digital painting)
edit: I added an outline
here is the WIP version: [link]