Start processing the wolf's layer and choose the Clone Stamp Tool (a brush of Smother Round Bristle) to copy the stone's parts, just to make them look more real:
Select after that the Burn Tool and dark out a little the stone.
Make the corrections on the sky's layer's brightness and contrast: Image
Correct the colors too: Image ? Adjustments ? Selective Color.
Make a copy of the sky's layer (ctrl+j) and blur out the copy, using Filter ? Blur ? Gaussian Blur.