A bit late but I will add my observation from 2012, Namibia (I'm quite new to DSF).

16", f/4.5, 225-300x, 2012.06.12/13. Hakos, Namibia:
ngc6337_pozitiv.jpgngc6337_crop.jpg

I very much like this planetary as well (just like other rings). This was the first planetary I drew from the southern hemisphere and I really wanted to see all three stars inside it, but saw only two. And they were very hard.
As I came upon this thread I was pretty surprised to see Howard's drawing showing 2 stars just like mine. Very good observations above!