The Devil's Double.

"Bowie" Blake is a gambler in a mining camp. One day, an artist, Van Dyke Tarleton comes to town with his wife, Naomi. He sees Bowie and decides he is perfect as a model for Lucifer in his latest painting. At first he refuses to pose, but Naomi talks him into it. Tarleton sees that Bowie is attracted to his wife, and purposely insults her just to get the right evil look in his eyes. But finally Bowie, whose feelings have become too much for him, quits.