Hmmm. As someone who makes his living from painting and drawing, I'm not really on board with this kind of thing at all. No offence, Doctor, but can't you just pay professional artists as you'd pay any other kind of professional? Put it this way, if you needed an accountant for your brewery (which you will), would you ask them if they'd work for beer? I realise you're asking in good faith, but this is the kind of thing that propogates the notion that creative workers shouldn't get paid like any other workers.