This artist's work is just too good not to post! (And I'm not fixated on skull/brain imagery--these three posts just randomly formed a theme.) The model is by Jason Freeny, an artist who . . . well, his website probably says it best:
Jason created his first fictional anatomy in 2000 with his depiction of the mythological "Incubus".
Armed with a youthful, overactive imagination, Jason creates smart, intricate illustrations that tickle the deviant intellect through a mix of hard graphics, pop iconography and wit.
During the day, Jason works in Manhattan as a mild mannered interface designer. At night, after the kids go to sleep, he can be found hunched over his computer developing works of candy colored madness.