I’ve got a soft spot for spirals
When I first started doodling trees (let’s not say how many years ago that was, eh?), I would start by sketching out the main branches and then fill in all the intermediate space with little curling, spiralling branches. In retrospect, they looked like little brains.
Lately, my style has gone more towards big spiralling branches and leaving a lot more white space. Like this one, from early in October: