Shocking work

Probably not a photoshop illustration, but I really wanted to include this artists work. I don't think he has a website, but you can visit his myspace at
http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendid=68280501

There are tons more images like this one. I highly recommend giving his profile a view.

Punchy illustations.

There is no limit to the depth, impact and detail one can add to a Photoshop illustration. Just look at this piece by John Lean. Very impressive. I love the glow and flames created in the background.
http://www.johnlean.com/