Beautiful setting. I love the foreground of the river especially and the birch tree as well. Your use of color and light is wonderful.
If I may critique? Past the bend of the river, the upper half of the picture, the water doesn't "feel" like it's flowing in a stream. My eyes catch there and look up the paper, instead of deeper into the picture. I'm no artist myself so I can't put this into the right words. Whatever you did in the foreground to make the water so real you did perfectly as far as I can tell, but the second half of the stream doesn't match up.