Want to learn how to make a dazzling water effect? Read on!
All this really has to do with is blending options. So you could just do a big scribble, apply this blending option, and have water!
Then, just doodle with an airbrush with a blue foreground color, and there you have it-- water! (Of course, you can do different colors, too...)
(Using white makes a nice silvery frame!)