>>6010547I really like it but the shading on the girl is off and the light source is off. The drastic style differences in shading between her and the background makes it look like she belongs in another picture and was copy and pasted there.
Now about the lighting:
The lighting is hitting the rocks from behind and to the left, her shadow places the sun behind her right shoulder, the light highlighting both sides of her body places the light source directly behind her back, the sky behind her back looks like the setting sun is in front of her. Choose which is the most pain in the ass to edit and edit the lighting for everything else to match it.
I would recommend placing the light behind her back to the left to match the rocks. Strip of tiny hint of setting sun behind her to the left.
To match everything to the rocks:
For her, shade the right side of her body facing away from the sun, then go bolder with lighting on the left and more contrast. Then soften her shading which will help imply a 3d form.
Pic related is recommended areas to add bolder lighting and shading.