In the Art World, the harder way is always appreciated more than the easy way. It takes a whole lot more skill to do this in Photoshop then it would in Maya/Max/Other 3D program. I worked for an Airbrush artist(Carl Chaplin) back in the 80's and his Artwork was fantastically good, but he was never taken very seriously because others were able to do similar work with actual paint brushes. Art isn't only about the final result, it's also the skill and work put into the result that weighs into how Good it is.
Some have said "big deal, it's just a bunch of (X)". Any work of Art is just a bunch of (X), even a good Photograph is just a bunch of (X)(pixels for Digital for eg). That's missing the point though, because all those X's need to be done and they need to be done properly. If it was easy we'd all be Artistic geniouses, but only a few are.