Amethyst crystal - study from life

I am not very happy with this one. I didn't pick very good colours and it was a hard subject to paint. Anyway, this is an amethyst crystal I've had for years. If I were to do it again, I'd use more intense purples, and I'd use a dark brown sepia colour for the background. The crystal is about the size of my fist, and I think it's actually my sister's, but she hasn't ever asked for it back. ;)Amethyst Crystal, 2008 watercolour, ~5 x 5 inches, $25 unframed