Commission: Sadness and Sorrow cover

I was commissioned by The Eighty Sixth Floor to draw a cover for their upcoming album Sadness and Sorrow, which is due to be released in a few weeks. I've done a few covers for them in the past: one, two, three and four.

Can I just say that I NEVER want to draw a piano again. Despite heavily relying on references (because I've never drawn one before) it was a real monster to get right.