Just to shake things up a bit, I decided to do this value study using the White, Black and Brown (instead of gray) pigments from my Prima Confections 'Classics' pan set. I rather like the effect.
Of course, I lost the white from the paper which would have given me a real glow. I rather tend to do that. I'll give myself the excuse that I'm painting small (8"x8") and wanted to avoid the use of masking fluid, but that excuse only goes so far.
Still, that's why I'm doing these value studies isn't it? If I were already doing things perfectly, I wouldn't need the study, and wouldn't have nearly the fun. Viva la imperfección! Or something like that, lol.
I found my reference photo at the Morguefile archive.