Paints tree in impressionist style. Leaves then turn to fall colors. You can adjust brush size and amount of fall leaves. As brush paints crude dots, the code randomly changes color for impressionist effect. Leaves change to fall colors at the end. (You could check "run without screen refresh" within red blocks to make it faster but I much prefer it slow).
Same as my previous impressionist painter: https://scratch.mit.edu/projects/650103923/ but with fall leaves, changing green to yellow-red, with color clustering. Clustering adds much to the effect, I think. I much prefer it slower for the painterly and growth effect, but can speed it by checking "without screen refresh" within red blocks. Using color sensors, this places dots corresponding to hidden painting colors. But color dots randomly change color within a range, and also influence subsequent dots put down, especially with larger brush size, creating a more painterly effect. For fall effect, change colors within spectrum and added clustering of colors.