Here's an image I did for 3Dtotal's Digital Painting in Photoshop Elements . Tutorial describe my process of an environment digital painting using traditional sketches.
Available here : https://shop.3dtotal.com/books/3dtotalpublishing/beginners-guide-photoshop-elements.html#t2 or http://www.amazon.com/Beginners-Digital-Painting-Photoshop-Elements/dp/1909414093/ref=sr_1_2?s=books&ie=UTF8&qid=1414407759&sr=1-2&keywords=digital+painting+photoshop
The full tutorial of it is in the book, including creative process, basics brushes etc...
Very good experience !