Great sky and I really like that you didn't supersaturate the colors in this. The solitary bird adds a nice point of interest and is well positioned in the shot.
Nivce image. I like the square crop but I would have cropped out more of the water as it does very little to enhance the image. The sky is where the primary focus should be in this shot.
This is a beautiful photo, out of the 4 posted into the thread I think this is the best. Beautiful capture of the colors in the water and the color in the sky is great.