The "Worlds most photorealistic art" seemed to raise a fair bit of interest so I thought i'd add this.
Slightly different approach than the last thread but an impressive tutorial all the same.

Now go make some art. picked by Milkshake 2 years ago

WOW. This stuff is amazing.
Photorealistic images of celebrities made entirely from vector art along with a few other photos of assorted food snacks.
All done with illustrator which isnt photoshop i know but I thought this would sit quite neatly in this section. picked by Milkshake 2 years ago

A fantastic tutorial on photorealistic digital paintings. picked by LatueOfStiberty 2 years ago

If photorealism is your thing, this is for you.
Also check out his video tutorials on Revision3. picked by extc68 11 months ago

Truly incredible stuff. Check out the portfolio, their CG people are insanely realistic! picked by queenofhearts 10 months ago

Ive started one of these myself.
Should be ready in about four years. picked by Milkshake 2 years ago

A gallery of deliciously creepy photorealistic chops depciting humans transforming into sharks, wolves, panthers, seals, crows and other animals. Several NSFW. picked by VooDooPeacock 1 year ago

Photorealistic CG water from SIGGRAPH 2006. These water animations are so good you probably couldn't tell the difference from the real thing. picked by shredtone 2 years ago