FZD School of Design has their own Youtube channel filled with free tutorials.
Feng Zhu, a well known and talented concept artist, has been uploading dozens of tutorials, free of charge, to the FZD Youtube channel.
Here are just a few examples.
https://www.youtube.com/watch?v=bMluMPUggJI
https://www.youtube.com/watch?v=QBChA-tkRLk
And you can see all of them here: http://www.youtube.com/user/FZDSCHOOL
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