Theres a possibility that the acclaimed artist John Howe (famous for his work the Lord of the rings books/films and associated merchandise) may be holding web seminars, giving you direct access to him via your own PC (yes, MAC too ;) )  If you go to the link below for information and fill in the survey on there may be enough demand to make it worth their while.
http://www.john-howe.com/news/more.php?id=276_0_1_0_C