I really like the brushwork on for the mountains! The direction of the light source is a little confusing to me, but otherwise I do love the colors you were able to tease together for the sunset and think they're really well done. Thanks for sharing yourself and your art!
Light is SUPER tough, but it can be the difference between awesome and extraordinary! I think taking down the intensity of the bright colors of the water on the left to add maybe a hint of reflection and a mild glow to the treetops on both sides would have taken the piece to another level! In that case it would have given a clear view that the sun had dipped just below the right mountain peak maybe 30 minutes prior.
I know this sounds critical but I want to stress that I still really like it!