Oil.

Sketch in the evening. Watercolor and ink in Hand*book . I took with me Da Vinci Kolinsky brush, it was interesting to use it. Ideally paper should be bigger for it, since the brushstroke, when you lay down the brush, took too much space on such small drawing. It is travel brush, so to put it back in the cap you gotta wait till it fully dry, annoying. Gotta look at the brush with innovative cap, where the head of the brush goes in from the back, I think it is from Rose or Rosemary. I have it bookmarked somewhere.