Xorn vs. Sentinel

11x17 Commission on Bristol Board

Pencil, Ink and Caffeine 

Gamora

Gamora - from Sketch Lottery

Old Man Slim

Project : Rooftop - Fan-Art Fridays featuring Cyclops.  Check it out, there's a bunch of really fun drawings and redesigns of classic X-Man, Scott "Cyclops/Slim" Summers.

Time travel and stuff.

Ghost Rider

Spirits of Vespance.

Snowflame: the cocaine powered supervillain

DC Comics character Snowflame is/was powered by Cocaine.  For real.  Not sure if he made it to the New 52 or not, but I don't see why you shouldn't petition DC to make it happen.