^^^^
For sure, these are all mid-tone values, no focal point. Where are the darks? Where are the lights? You have a strong 1 point perspective in this photo which should take my eye, but instead im drawn to the bottom 2 corners, because they are quite literally the only dark points in this piece.
The original photo worked and looked realistic because the sky was all one light value, but now that you have photo-imposed those other clouds with all midtone values, I can for sure tell this is a 'shop.