This has been moving around the blogosphere and it's my turn. I don't have a large collection of spanking pictures but the following is one that I really like.
Unfortunately, I can't remember where I originally saw it so don't have a source. If anybody knows, please let me know so I can credit it. Now this picture isn't exactly a spanking pose, but there are many things I love about it. The pensive expression, hesistantly pulling down the panties, how her body is angled. Great picture.