I'm participating in the virtual sketch for September. The reference was such a lovely floral that I couldn't resist. Besides it gets me back in the sketchbook after a summer of gardening. If you'd like to see a more detail image, you can look at the Flickr version.
The original reference was provided by Sharon on the Virtual Sketch Date blog. There are links to a larger image on Flickr. This photo had such great contrast that I knew it would make a great black and white image. I'm thinking of doing this in pastels as well.