He's really sort of the devil. He's completely emotionally detached. He has no empathy. You find that in psychopaths. It's about power with Voldemort. It's an aphrodisiac for him. Power makes him feel alive.
It wasn't until he was 27 that Vincent started painting. He was self-taught, save for attending art school in Antwerp for a few months only 4 years before his death.