Starting this thread to help document tips to help developers draw top-notch picture resources.
While attempting to draw tree foliage, I was tempted to simply use a combination of fill areas consisting of lime, green & a green/black dither. This did a pretty good job, but it lacked a level of authenticity, it just seemed too regular. In Companion there is a option in the 'pen style' to select a random pattern, essentially a 'spray paint' tool. Selecting a random pattern with a large pen size & applying it judiciously over the filled areas generated a very pleasing effect.
Also works great for creating 'bunches' of flowers on the ground or creating grassy areas.