Feng Zhu stands out from the crowd.
I recently watched an hour long video of his Let's Draw series in which he masterfully assembles a few scenes with some crude painting, photo textures and some clever light balancing.
In fact there's much more than that going on. Check it out.
What I find fascinating about this video is that the artist doesn't care too much about wasting time on drawing every detail such as rock textures. Pretty insightful stuff.
Feng's Facebook page is pretty useful - https://www.facebook.com/FengZhuZhu