Hello @marya77! There was another user on steem last year, painting with coffee but the guy was using instant coffee. I don't know what's happened to him as he's not active any more, unfortunately.
As I see you're not using instant coffee but real coffee. I've never seen anyone here doing that. It's interesting, the tools you are using and the process as well. I love the orange light and the reflection, the painting turned out great. You have some experience, I can tell by looking at the video. Well done, keep up the good work!