Wait, Lain did that?
I agree, that's some fantastic coloring. XD The only thing I worry about though is values. Kid, right now, despite having only "slightly" darker value than the background seems to meld in with it, given the value range of the background itself, and as a result it starts to look murky.
Still, as a practice piece, this is pretty great, with some pretty good brush-work on the cliff.