This is one of my favorites of the year so far. It may not be my most realistic work but it definitely says something. I used the dark backdrop here but it was mostly in light, so I painted it that way. I'm able to get the grey quite easily by mixing transparent red iron oxide [burnt sienna could work too] with cobalt blue - from there I can make it more red, yellow or blue or whatever color grey. I experimented with different brushes on this one as well, used some softer synthetic-haired brushes. Going to experiment some more but seems like I will use them a lot more in the future for sure, so much easier to use.