Idea for this was a tripedal alien herbivore in the rainforest of a tropical planet illuminated by a hot blue sun. (Obviously I'm big on the tropics, and UV-saturated environments in general!) It was part of a concept I was working on for a planet with such high humidity that the land megafauna would be more like fish than terrestrial vertebrates. It played into a lot of other concepts I was working with at the time, such as high-metal environments, toxic and electrical defenses, etc. (I'm a big fan of David Brin, as well as Wayne Barlowe.) Anyway, the wildlife on this planet relies on an active radar sense rather than passive visual organs (the high levels of UV radiation may have something to do with this). The yellow spot on the upper body segment is thus a radar aperture.
The creature is a 3D model created in Ray Dream Studio. The surface shader was taken from a scanned photo of a tang or surgeonfish, while the bump map was created from a scanned photo of a piece of turquoise (most notable in the "veining" across the creature's hide). The background is a heavily cropped and Photoshop-ped photo from a book on Australian rainforests.
I wish I had a bigger version to share, but the original CGI model was lost in a hard drive crash years ago. : (
UPDATE: I stumbled across a bigger version hiding in my old "Wallpapers" folder, so here ya go!