The posted photo (attached) was rejected for technical reasons. No specific reasons were noted. I would like to know the actual reasons so that I can fix them, etc.
I think the main issue is your overall white balance. The mist above the water is too yellow and there is a slight yellow cast to the whole image. The river in the shaded area should be a bit bluer - cooler. So I think the colour balance is not so well balanced.
Technical issues cover White Balance, Saturation, Contrast and composition.