I've been working on my back for about 3 years now and it has been a great journey and humbling experience. During my sessions of pain I've learned a lot about myself mentally and physically and would also have the best dreams of my life the nights after my most painful sessions. I would say my shoulder blades, ass, and inner thighs to be the most painful. Anyway I've extremely enjoyed seeing the progress which is about 90% complete started color a few months ago and it just makes the piece pop which has motivated me to finish it by end of summer!