Watson the Jeopardy-dominating computer by Oren Haskins.
Mecha-bull - - one of several creatures posted by Peter Chan.
Lady with Teddy by Cali Rezo, who has art on sale here.
One of several Batman illustrations by Jackson Sze.
Batgirl costume design by Miles Teves, who has a huge portfolio of professional work. His commentary on this particular design (intended for Alicia Silverstone) is pretty interesting.