Change the layer's Blending Mode on Lighten and combine the sky's layers: Layer ? Merge Down (ctrl+e).



Now we'll insert a man's face instead of the wolf's one on the animal's body. Open in a new window the necessary picture (ctrl+o).



Mark out the face and the neck, using Polygonal Lasso Tool and place it above the wolf's layer (ctrl+t).



Then create a mask out of this layer: Layer ? Add Layer Mask ? Reveal All and choose the Gradient Tool of black color to start insert organically the face. We have to erase also the coming out wolf's muzzle.