Drawing with a charcoal pencil then adding Payne's Gray was a new approach for me yesterday. I was at my weekly life drawing session and thought I would give this combination a try. I love Payne's Gray however artists stay away from it because it doesn't blend well. But it's such a lovely gray! So, I decided, the heck with it, and I purchased Winsor Newton Artist quality Payne's Gray.
Well... it doesn't blend nicely. It's sticky and doesn't want to cooperate. I'm happy with my results but it was a real struggle.
Also, after spending money on the artist quality stuff, it turns out I much prefer the Cotman student brand of Payne's Gray. It's a lot less of a "pains gray".