I sell fanart at anime conventions, and this picture is a prime candidate for that. :) I'm being hyper-conservative with it, but considering that I got the basic Hakkai outline by printing out the image reference in blues, then sketching my lines in on top of that, even though I've done a bit of changing, I don't think I've done enough to satisfy myself that it's fair use, so I'm sticking to pics that explicitly allow free noncommercial and commercial use. I just can't find any pictures of drummers where they're not obscured by the front men, or where they're going crazy.

I'll end up finding other photos and using them as regular reference if I have to (not tracing the major lines but making them up myself), but there's a certain level of draftsmanship in Hakkai that I'd like to keep in the other three panels, and it's damn hard to do that when I'm unfamiliar with the instruments and how the body moves when they're being played.