I am drawing a silly photo for my friend, its 2 people camping & I just added a river. I am using my ipad so I cant upload it, however here is the reference photo I used (this photo was not made in artrage though) I circled the part I am talking about.

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So if anyone knows a technique to create this effect (the effect of water hitting rocks, causing the white splash/foam), if anyone can try doing it, or tell me how? I would be a very happy .... camper .

(btw I am new to this site, I hope I didnt break any rule =X )