Nicely rendered in all respects except that the sky is not working for you at all. A quick mask of the sky area followed by a black-to-transparent gradient laid over the sky on a multiply layer would have done wonders to increase the visual depth of the image and take it to the next level.
I took the liberty of doing this very quickly; the mask was not refined, so there's a little bit of edge haloing, but this can easily be avoided working carefully at higher resolution. What do you think of the change?
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