Over on Facebook, I run a monthly challenge group with over 19000 followers. Every month, I supply a theme and photo-references and invite artists from around the world to draw from the references to create art. The challenge has been going for years - I participated back in 2013-2014 when it was run by its founder, artist Alberto Ruiz. And now that I run it, I still participate. Here are some of my entries:
Trinquette Challenge pt 1
Pin-up art and sexy images from a monthly photo-reference challenge.