lol I kept wondering why you posted your question in this forum and not the 2D and Traditional Art Forum, but then I thought well maybe he feels more comfortable in this forum and know more people here that will give him a quick answer to his question. lol I should have re-read your question and noticed you mentioned effect and should have realized he's trying to achieve that effect in Photoshop. I promise my brain is functioning at a higher level today. lol I can't think of anything in Photoshop that would give you that effect really fast without using a few filters and brushes on it, but some elements of some software called Rebelle reminds of what the person was doing in the video. You can make the paint drip and move to certain places. After you do that, add a texture to certain places like the sand and the foam from the water to give it that gritty texture. So that's my best educated guess, I know one of the members has to have a better and faster way to achieve the look of that artwork in Photoshop.