Influence of Vallejo and Julie Bell cannot be underestimated on fantasy illustration. Personally, when I studied anatomy for animation work I did back when I was still doing he was a big part of it, even though his work did incline more towards bodybuilding kind of types. Stylistically though, big influence on fantasy. Sorayama was mentioned as well. Again, personally it was: Burne Hogarth, Frank Frazetta, Boris Vallejo and Julie Bell, Luis Royo, Sorayama. Even they're not of same period, I group them together as major influence and study sources.