I first thought its the sky with rain/snow happening, but then was confused by the middle area where its blue. further confused by NilanjanDa's comment now (Whether its the texture of a sky or the water below?).
But, I loved this image. It evokes a strong emotional response from me taking me directly to the place and enjoying the beauty that it has to offer. I am thinking its the water(lake) below and depth is added by the mountain snow and trees. Loved this composition. Would be waiting to hear your thoughts on this and how made this image