I'm watching a video tutorial on how to paint landscapes, and the artist makes some great use of fanbrushes, e.g. to create the leaves on trees, or white splashes on water. I'm having some problems duplicating this effect in Artweaver, can someone give me tips?

Now, for the trees, I was able to use sponges and the "Artists" brush with the "Van Gogh" setting (it makes a collection of dots appear), and the effect was more or less okay as you can see below, apart from maybe the fact that those dots were a bit too regular (a complaint I also have about the airbrushes etc). But I'm kinda stuck on the water splashes. Below you see, from left to right: the original artist's painting, two of my pathetic attempts to copy it with Artweaver, and a tree I drew with Artweaver.

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