Hello stef1. I'm sorry it has taken me so long to reply to your comment. A lot of things are happening here and they all seem to be happening at the same time. Yes, as I remember I mixed some yellow and blue to catch the green, but sometimes, if I'm in a hurry and if I'm sketching just to give myself some information about an object, like the chandelier, I'll just paint in some unmixed color, like the green, just for contrast.