Here are three of my small pochade paintings in water-soluble oils. They are all just 6″ x 8″ and painted on board.
I’ve used an underpainting in each case – just a mid-toned colour, which gives continuity to the painting in the places where it shows through. Most were painted in under an hour.
Here’s a video of me using the pochade box which is taken from my online oil painting course.