This is a wonderfully done picture. you have captured that very perfect moment of twilight. the clarity between foreground and background is phenomenal. the rocks in the foreground frame the lakes calm waters excellently and their dark colors also compliment the bright colors of the evening sky.
What seperates this from just another sunset photo is the way you captured the clouds relections in the lake. It creates an almost surreal sense of serenity. Night is on it's way but it is not to be feared but to be embraced.
Overall this is an excellent piece of imagery that calms and I really wish I could have been there.