Not a direct answer to your question but if I were in a situation where I needed art like those faces and I didn't want to spend money (and believe me, there are lots of people who wouldn't want to be paid much for great work out there) I'd "cheat" by initially using photos and Photoshop to do the hard work.
Indeed, I just gave it a quick go. Searched for "old russian woman" and did some stuff with posterization and pixelation: http://imgur.com/a/Tj2Os - it's not great, but it took like 3 minutes. Obviously, I'd be looking for photos that could either be heavily edited or were open licensed/public domain if I were doing it for real.
Indeed, I just gave it a quick go. Searched for "old russian woman" and did some stuff with posterization and pixelation: http://imgur.com/a/Tj2Os - it's not great, but it took like 3 minutes. Obviously, I'd be looking for photos that could either be heavily edited or were open licensed/public domain if I were doing it for real.