I bought a scrap of suede matboard which I used for the first two. I really liked this as a surface. The OPs go on very opaque (the matboard is green).
Cersei 2.5x3.5 inches
This is an ATC. I used a tortillon for all the details.
Teacup 5x7 inches
Pears and Milk 6.5x10 inches on UART dark
Before I did this one I read a bunch of the articles on https://www.howtopastel.com
(they’re about soft pastels but I think a lot of the same techniques apply). And I tried to follow their advice, such as working on the whole piece simultaneously (not working left to right as I normally do), using an under painting in contrasting colors, and generally trying to make it more colorful than the photo. I’m pleased with this. It’s more colorful and energetic than my usual work.