I painted plein air today on Mousehold heath overlooking the City of Norwich. I painted this oil in 2 hours. I wanted to paint in watercolours but unfortunately too cold for drying and no access to any means of drying quickly i.e. hair dryer or car heater. I used a pochard box resting on my knee see photo of box and painting. The box holds 3 x 10" x 8" boards.
See photo of scene and good sky that developed while I was painting.

I am a confident watercolourist and know my way around the medium having used  for over 20 years. I am the opposite with oils and only use them for sketching outdoors.
In the photos above I focused one shot on the sky and one on the foreground.