The sun looks like it is melting in the water. I like this effect.
I also thought about adjusting the colors under the sun, but then thought better leave it ..
I think giving definition to the borders of the sun breaks the depth a bit... I'd also look into how a sunset affects the color of the water as well, it seems a bit localized in your image.
I like the texture you've included though and the color choice seems pretty spot on.
Design wise what purpose do the birds serve in this scene?
It looks like it was painted by a post-Impressionist. Cool style. :)