You will be led to the knowledge of the internal things which are invisible to you, by the external things which you see before you. . . . Even so then, we can represent to ourselves in thought the Author of all that is, by contemplating and admiring the (visible) things which He has made, and ever brings into being.
- Hermes
The sky is very well depicted and the water's colors are nice. I do see a bit of grain in the water, but it's probably because of the low light conditions in which you were taking this pic. Sometimes I use too low an ISO speed thinking that I won't be able to see it if I don't, when actually I'm only exacerbating the problem. I'm sure opinions will vary. Overall you've done a very nice job.