I found this great post on Photoshop Essentials website about adding textures to a face.
So, instead of writing a post of how to do it I’m going to send you over to their fantastic blog.
http://www.photoshopessentials.com/photo-effects/texture-map/
Here is the image I started with taken in Newfoundland, Canada.

After following the Photoshop Essentials tutorial this is what I ended up with.

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About Mary
I am studying for a Bachelor of Arts degree in Photography at Plymouth University.
This blog is a means of sharing my journey of discovery with fellow photographers and those who are interested in visual arts.
The work on this blog is a blend of my module research and my personal interests.
The majority of the work placed on this blog is university based work.
I do hope that you enjoy this blog: through it, and by it, you can see the breadth of studies undertaken.