I know that the unlevel look is due to the curve of the shore line, but I think that a right rotation would still help this a bit. It would level the tree line in the back, making it look more 'uniform', if there is such a thing. The color is very nice. I like how the sky is just a bit lighter than the reflection of the sky. Focus and clarity are good. The view would be much prettier in summer or fall, but some silly people chose this challenge in winter. lol. Good luck in the challenge.
I realize it is the curve of the lake, but hte left side being lower than the right makes it feel lopsided, even though the picture is probably even. Maybe include more of the shore on the left, or crop it before it further on the right so that the section that feels curved would be eliminated. Bet this is gorgeous in summer!
First thing that springs to mind is that the horizon isn't straight. Nice use of reflections. The left hand side of the image looks far more interesting than the right, and the house trying to hide in the trees is a little distracting. Maybe panning to the right or zooming in on that side would have improved this?