I'm not a huge fan of the computer landscape, so I don't really know what to look for or what I'm talking about, but I was requested to comment.
Overall I think the shadows you've done a nice job on. The overall 'white balance', if you will, in the sky seems a wee bright and over-saturated to me. Nice detail and color on the foreground land and I really like the water!! The water's the best I think, very life-like!! Love the white caps and overall movement.