yeah tutorials would be great! i find it also helps to look at photos and try to break them down mentally into parts/colours (eg. the deepest parts, shallow parts, currents, any foam/spray etc); using multiple program layers for each layer of water also helps at the start. but with art, at least with non-photorealistic stuff like mine, it just needs to communicate that it's water and doesn't need to be exact! though of course it's always handy to know how it all actually flows and how light passes through it etc 'cause that will inform your interpretation of it