The pastels with the rainbow in particular burn so bright... and nice work with capturing the glow on the ground and, somewhat, on the mountainside. It's a nice piece, though the sky... seems a bit green too? Colors outside of the rainbow float together a bit. Maybe that could've been a main focus, it does catch your eye but doesn't really dominate the canvas...
Either way a solid first! Do like the atmosphere. Would be cool to see more.
-cd-