The picture is underexposed, the sky is indeed a bit uniform, the picture is missing contrast, but the really big problem in this picture is the processing:
There is no fine detail left, which lets me assume that this is a small sensor picture, taken with a phone or similar. This will make it very difficult, if not impossible, to correct this picture and get it passed.
ABAMBO | Hard- and Software Engineer | Photographer
This appears to be a mobile phone image due to the lack of detail as a result of the small sensor. Where there should be sharp detail there is instead just blobs of color. The sky is also overexposed, and as @RALPH_L indicated, the distracting wires could have been edited out.