The faint dawn colors are nice, but I think it would have been worth to wait a while longer to see how the sunrise would develop. The silhouette seems to be a bit flat. I'm trying to distinguish a particular shape that would add interest but I can't find any It would have been a good idea, I think, to have someone look out so that you could see the profile of their face as a silhouette.
These are simply a few suggestions, thanks for sharing your photo!
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Very good indeed.
Ed.