Brandon – Great questions…I’ll try to be concise in some answers.
Biggest influences in the field: Hugh Ferris, Kirby Lockard, Michael Doyle, Earnest Watson, Helmut Jacoby, Richard Baehr, Thomas Schaller, Frank Costantino, Syd Mead, Steve Oles…the list can go on and on. While I haven’t had a mentor, it’s not hard to find great work to study and learn from. All the techniques and media vary but the fundamentals are the same – composition, value, etc.
I’ve always liked the work of concept artits and matte painters and if you get a chance, check out gnomonworkshop.com. There’s a ton of info, tutorials, DVDs from some of the best in the industry and it’s a great resource for picking up new (and old) methods. It’s also a great place to see what the special effects industry is doing – they are usually the first to push the digital envelop.
Rick is right – stay with the search, there are a lot of disciplines to learn from and you never know where it’ll take you.