Graffiti Artist

I caught this Graffiti Artist at work.

Lots of yellow here but there wasn't anything distinctive I could make out.  But to be fair it was early on and he is overpaiting (spraying) an old work so it may take a while for the new work to take it over. 

I did however get a fairly close up look at the draft sheet he was working from but I'm still none the wiser!