I agree with Scim! That sky is as pretty as any one I've ever seen. You really did get the colors and the shades just right somehow! I have never seen a pink sunset in my life, and I thank you for introducing me to one. This is surely then something that I would love to see in real life. The picture has a nice, romantic, soft feel too it.
The dark gray at the bottom and the gray reeds are very stark against the softly blurred background. My only suggestion would be to play around with that area if you do a sky study again as it looks just a tiny bit flat compared to the beautiful, realistic effects of the sky and water. This is not a criticism - just an observation for future works, okay??
I think it's lovely. The overall effect is quite beautiful!! I am gonna give you a 6 because that sky is really something!! I have not yet mastered how to do a sky properly (and, in fact, am a bit afraid to try to do one if I'm honest) so I greatly admire when someone gets that most difficult thing right!!! I might even use this as a study to practice and learn doing skies myself!
Thank you all for your comments, I really appreciate it.
PiaShantee: thank you for suggestion. You're so right, it needed more attention. My only excuse is: it's my first attempt to draw a sky, so I was particulary focussing on that part.