It looks like it was done like this:
-Hair highlights for the shape of the head.
-Two shirt wraps with top and bottom eye shadow for the front of the shell.
-A backpack for the back of the shell.
-Finger-less gloves with claws for the hands.
-Seizure eyes with a tennis ball for the eyes.
-The demon teeth with a nose beneath it for the mouth
And the background looks to be made up of two scarfs, an animal tail, the minigun, tears, demon wings, a Playstation 3, and umbrella, and a cape.