Upload & Sell: On
This composition is nice. The empty space on the left isn't empty, you have water lines that balance out with the rock on the right really nice. My only thought would be to the sky. No doubt it was a colorful sky for you, but the color seems a tad bit off, it has less contrast than the ground layer. So first off with a layer mask, I would increase the contrast a bit, and then a bit on the brightness on darker areas. Maybe just 10% saturation too...
This is almost there.