I did this last weekend;
Most of my sadly limited creative time (poppa gotta keep a roof over his head) has been spent completing at least four or five months worth of script before drawing the thing and posting it up. Scripts don't make for interesting visuals so every couple of weeks I push myself to draw something... anything... to keep my fingers limber and my Mastodon and DeviantArt accounts alive.
For these illustration pieces I always pull a Norman Rockwell and use my own photos for references. What do I know about a DJ set up? But I do have photos of DJs at work. It's never about what you take. It's where you take it.
My non reference work usually looks like this;
This is closer to what my comic will look like. Black and white art, I mean. Not the Spirit Bomb.
Anyway, sorry for the ramble. I need more coffee.