Very cool, Adam!  We see that ring around the moon here quite often.  It's because of the thin cloud layer, and the moonlight is lighting up the moisture in the cloud, forming a rainbow. 

Aside from that bit of science-y stuff ... Great shot!  I had never thought to paint such a large area.  Very cool!

"If your pictures aren't good enough, you're not close enough."  ...  Robert Capa