I took the photo of this Rabbit Brush shrub in 2002 on a trip up Hwy 395 to Mammoth Mountain from Ventura County in November. There was fresh snow on the Sierras and the leaves had turned orange and rich red-browns on all the willows and brush in the dry washes that ran from the foothills down into the Owens Valley. I rediscovered it looking through my old photos this fall and decided it was time to try painting it. I had had some practice painting skinny twigs and thought I might be successful this time, but was still very surprised at how well it went.
I've never had much luck painting thin lines with small round brushes, and especially now that my hands shake more than they used to. But what I have found that works is a 3/8-to-1/2" bright brush, synthetic or fine hair, using the long edge and touching it as lightly to the canvas as I can. The paint has to be liquid enough to flow off the brush, and if I make a blob or the line is too thick I swoop in immediately with a clean brush to pick up the extra. The other attribute of a brush this size is that it will hold a fair bit of paint, and it's not too hard to get a nice long line before you run out of paint. Only new or un-frayed narrow-edged brushes will work, and I try to keep a newish one on hand just for this purpose. Once I cover an area with lines I'll usually let them dry before I paint on top them; once I get good ones down, I don't want to risk messing them up.
In the photo, the sand & dirt was covered with a layer of tiny gravel, but I decided that was more texture than the painting needed, and just shaded in the varied grays and tans without offering much detail. Painting the live and dead branches took the most time, as I was trying to capture their varied colors and "bundle" appearance.