
By Jeremy Vanhoozer.
Squiddie

By Kyle Hunter. [Sketchy Business]
Triton

By Monsterpocalypse.
First in the Future

By Frank Frazetta [Golden Age Comic Book Stories]
Marrina

By Jesse Hamm. Lots more Alpha Flight art in that link. I especially dig his Heather Hudson and Sasquatch.
The Sea Girl

I don't recognize that signature. Anyone know? [Galactic Central]
Aquaman, Anyone?

By Jesus Saiz. [DC Universe: The Source]
Aquaman vs. Nazi Fish

By
Spawn of Space

Artist Unknown [American Pulps & Magazines]
First Wave

By Rags Morales [DC Universe: The Source]
Catwoman

By Alex Ross. This will always be Catwoman's costume to me.
Golem

By [Sketchy Business]
Play Time

By Sam Hiti. Check this one out too. It's sort of a sequel.
Don't Feed the Bears

By Mel Milton.
Wooden Ninja

By Eric Zermeno.
Odin

By Pere Pérez. [Victor Santos]
Ride of the Valkyrie

By [Sketchy Business]
Zoom Quilt

By lots of people. You have to click through and watch this. It's a Flash animation that zooms inward, taking you deeper and deeper through a continuous series of paintings and eventually looping on itself. Amazing.
Space Lion

By Jeremy Vanhoozer.
Teeth

By Scott Burroughs.
Space Squadron

By Sol Brodsky (maybe). [Collectors Assemble]