Ok, it is somewhat subtle and since you two didn't notice it, I suppose few people would, but I'm talking about the area I marked red.
It's completely filled with the exact same shade of beige/ocker(how do you call it?) as opposed to the other mountain, whioch is subtly textured.. Also the trees on that side are cropped because of this.
Looks exactly as if you applied a filler with some tollerance.