I really love the color theme of this, the muted colors work beautifully together. The use of atmospheric perspective (I think this is the right term?) is also really awesome. And the panda's awesome, but panda's are just made of awesomeness so that's not too surprising.
Seriously, have you ever thought of making a tutorial? I'd be really interested in learning how to do digital drawings. I can photo-manipulate, but anything else digital turns out awful. And what program do you use for these? I think I remember using Adobe Illustrator in a class, but are you using a different program?