Tutorial : Advanced face swap ( Auto-blend )

Okay, so finally here it is : a short addition to the first face swapping tutorial which did not cover what to do if the people's skin color differs. I will be using the following pictures as an example :

We wanna go ahead and put Samuel L. Jackson's face onto Chris Browns head. As you can see the skin tone and the lighting are different. At this point I want to state that there are various ways to accomplish this in Photoshop and I will be showing one way to do it using the Auto-Blend function of Adobe Photoshop.  

Tutorial : How to face swap in Photoshop

Here is the tutorial as promised :-)
Let's quit the unnecessary talking and get started :

For this tutorial we will be using the following picture :

(We want to copy the right face on the left girl)