I think bespoke artwork of DJ's wouldn't sell particularly well because there are only a handful of DJ's who would be classed as being iconic. Images of popular musicians/personalities only really works when they have achieved iconic status. Turnmills tried to auction paintings of DJ's as part of a charity event, for Nordorf Robbins I think, and it wasn't as successful as they'd anticipated. The art market is a tricky beast at the best of times and my tips would be to develop a very unique style to your work and take on bespoke work, since individual buyers want something truly unique as a general trend. I have friends in the art world and if you can create a series of works, I'd be more than happy to talk to them, on your behalf about your work and see if they'd display in their US and UK galleries, plus sell online etc.