It's a good composition and water level - sky is nice too. Reflections are utterly bob on. You've avoided a big compositional mistake here (clue right side, tree at nearmost edge bank - it's all in not cut off) and you've nicely centered the two mountains in the middle with an even amount of sky, reflection and woodland both sides. All in all 11/10 for compositional mastery.
I nearly went last night but was concerned it would be a bit grey - what's happened here is the low evening sun has been blocked out by cloud - it happens and nothing you can do to change it - you just need to go back and recreate this composition again.