A little step by step visible on my Tumblr here : [link]
When I saw this photo ( [link]
) I just thought that I HAD to do a painting of it. So awesome... All congratulations belongs to the ref and the original photograph (sadly, I don't know who it is, for I found this photo on pinterest.)
Photoshop, about 1h30-2h.
Another use of this stock [link]
EDIT : Thanks Pearlypony for the link to the photograph's gallery : [link]