You know, it's an overall philosophy of mine that graffiti works better on a canvas.

Sure, you might not get the overall space you need to make your design on a canvas, buuuuuuuut it's surely much better than going to court for defacing public property, right? Best of all, you can sell it in an art museum because you can truly take it anywhere.

This works especially well in this case, as a digital drawing, where you can undo and edit as many things as you want. 

I wonder why graffiti vandalists haven't caught up on that...