Any fans of Bosch's work should also check out Dave Patchett (http://davepatchett.net/).

I'm not sure if Dave's been active recently but he's best known for the use of his paintings as album covers for seminal UK doom metal band Cathedral.

I was fortunate enough to meet Dave in 2005 and purchase one his paintings. Chatting with him he confirmed my suspicion that he was heavily influenced by Bosch.