Seeing this cover and some of the other covers that come out from DC, Marvel, etc...I wish they'd publish an annual "Best Of" covers book. A lot of these works deserve to be presented in a nice hardcover format to display them.
I like this one a lot, reminds me a lot of some of the cartoons from the 50s and 60s that had a bit of a "trippy" look to them.
The best compliment I can think of is that it looks like it was done 100% NOT in photoshop. If you hadn't said anything I'd assume it was a multi-media,pen and ink, acrylic, colored pencil extravaganza.