if i had the choice, one of them, Frazetta! His productivity is outstanding! how he worked with colour on canvas would be great to learn,everything he knows about art and selling it would be great but his ink strokes on women and how he draws female charakter would be most interesting David Finch! i wish he could look over my shoulder while i draw sometimes, how he shadowing dark scenes, and render character, and put it such fast on the paper is stunning, and the big thing for me is,that it fits in the frame on the paper like it have to, the figure is not too small or to big, especially when he do his youtube streams, when i do it its never the right size thats its looks good, like his! im dont mean his style, just how he scale it on paper, shows me ther is some knolledge i cant teach it myself! i train it for two years now, i dont get it, and he could tell me where to put wich rendering and the distances between the rendering lines, what a problem is, and what i really want to learn two are these cramped poses like hulk does when he is screaming angry, or carnadge would do, with the arm turned way back, cramped poses are such hard to make! i could learn alot from him in very short time! Daim! his letters in 3d! awesome graffiti artist! Karl Kopinskys got great techniques! wich i prefer to learn from him in apprentice! Alani j. ! alexander rischkin! awesome in human form and i suppose not only a real hard question... and there are so many more masters could writa an assey for it. but the anwer is david Finch! He would be stressed out! but it would be worth it!