This ‘half-hour’ watercolour demonstration, again following the step-by-steps in Paul Talbot-Greaves’ Collins 30 Minute Landscapes in Watercolour, actually took me almost an hour but, as with any watercolour, part of that was waiting for the paint to dry.
I went wrong with the colour wash for the distant trees, accidentally mixing a darker green intended for the middle-distance trees. In trying to dilute this mid-wash, I ended up with wash-backs. But they do have a dendritic look to them!