Simplified the red terrain to fit the cartoony feel a bit, changed up the atmosphere and toyed a bit more with the rocks and composition to match the concept a bit better. First go at flora, flowers to come Update:
very nifty. I think some blue in the terrain would bring some nice contrast in... maybe some little blue alien flowers/polyps. I recommend Wayne Barlowe's expedition, it mostly focuses on creatures but it has some cool alien landscapes in it as well. There's another cool book but I can't remember it's title, it's an art…
I actually think you took out a little too much foilage. The flowers were a nice touch before especially. I would probably add just a little of it back in, maybe in the forground front left. I think you need to go in and bump up the contrast on this image a little bit more (not too much) but just a little to brighten the…