Since they seem to be official drawings, I´ve added both FMA´s and Soul Eater´s mangakas to the tags, but I don´t know how to change a tag cathegory, so if anyone can put "Okubo_Atsushi" in the artist cathegory...
I remember when this apeared on the cover of Shonen gangan. It was pretty funny considering how around that time FMA was geting close to the grand finale and Soul Eater was just getting popular on the internet, which lead to a lot of FMA fans in a painful suspense because all fansubs jumped ships to translate SE. Good times.