I'll occasionally use round brushes both soft and hard edge straight, sometimes the charcoal brush and the fan brush.. but aside from those 4 premade brushes, everything else is custom brushes I made specifically to produce these effects. the shrubbery, trees, trunks, mountains and the texturing, grass, clouds... since we aren't able to directly reproduce his dabbing techniques or how paint breaks on a palette knife in photoshop, I had to build tools that would duplicate the end results those techniques produce. I'll be setting up a patreon for Christmas and offer the brush set I use along with the layered PDFs of the landscape paintings I produce so you can see how i build up the scene from sky to foreground layer by layer, if you're interested.