Troll-free zone | 1500px max for photos | Play nice!
This image does convey winter, I feel cold just looking at it. Use of ND helps smooth the water which is nice but maybe a POLARIZER filter would have helped too.
Having said this, I wonder if you could have made this image a horizontal landscape rather than a portrait format. I say this because the upper 1/3 of the sky really does not seem to add anything to the image and could have been left out in favor of a wider view of the river. Personally I feel that landscapes such as these usually show better in landscape mode. Also, the image looks to me as over sharpened with a visible halo on the edge of the mountains against the sky. This is easy to fix in either LR or PS.