As @Jill_C said, the picture is underexposed. You see that clearly with the histogram:
The whites are missing. I also agree on the white balance issue. I do not see chroma noise, however. In addition, the sharpness falls off at the borders. I would recommend correcting what can be corrected, maybe adding a small amount of texture/clarity and trying to resubmit. The image as such is nice.
326351:
I agree with @Jill_C. I would also enhance the sky by adding more contrast. In that case, you will need to correct your sensor spots as they also get “enhanced”. 2/3 to the right, there is also a black spot, probably a bird, that I would remove.
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ABAMBO | Hard- and Software Engineer | Photographer