From my sketchbook, a favourite pitch pine tree done with my Schminke Horadam travel paintbox and a couple of Winsor & Newton tubes. (Not to mention the Daniel Smith Quinacridone Gold: how I love that colour!) And a bit of gum Arabic, a highly traditional (indeed ancient) paint binder. It gives a gloss, not that one can detect it in all lights. For purposes of illustration, you might think it would be irrelevant. And yet, it changes the handling of the paint as well, and I believe that everything you do with a picture contributes to its final affect (yes, ‘affect’, though ‘effect’ makes sense, as well). The direction of your strokes, the amount of layering, lifting, and re-working, the colour and the texture of the paper you’ve chosen, and so on. The pitch pine here looks especially summery and jolly, I think.