I found the lady who ruled this painting in the final tower, beyond the dragon's bridge. She was quite enchanting and surprisingly, not hostile. Apparently this world was one of peace - except since I didn't belong, everything was hostile (to me). She begged that I simply leave her and her citizens alone, and since she was so polite about it I accepted - returning to Anor Londo.
Feeling sufficiently powered up I decided it was time to return to the Kiln of the First Flame for a rematch with Gwyn. He still slammed me on the first attempt but it was then I found his weakness: I could parry his giant flaming sword. And so, without much fuss, I counter-stabbed his crotch repeatedly and killed the "Lord of Cinder".
Right in the crotch - just like I practiced.
A bonfire waited behind him for me to "link the flame". And what, become the next Lord of Cinder? No thanks. With a 180 degree turn I marched right out of there where Frampt and his fellow sock puppets all bowed before me. Hah! I am their new Dark Lord, and now I have the power to do ANYTHING!!! BWAHAHAHAHA... ha... wait a minute...
They threw me back into the Undead Asylum.
Welcome to NG+.