NNNNNNNNNNnnnnice!!!!, keep it up man!, you are really pushing yourself to get to your best, keep it up!!.
Well, enviorements is something i am weak at, but, i know that the time of the day changes the quality of the lightsource, and you used a weird lightsource wich i cant really describe, what time of the day is it?, the color of the sky corresponds correctly to the time of the day?, the color of the light is correctly placed on the scene?, what type of light is it, difused or direct? (difused or the other one, i am not sure of its name). Also try pushing your darkest values a little more to the dark side ( ), make the cast shadows more defined.
The mountains need a little more shadow and light too i think... but overall its a real nice picture, but i think you need to study how light behaves in such enviorements, it would make a huge difference i think.
K, good luck, keep pushing yourself, you are getting so better