Simple River (Steady Picture)

Im looking for a simple way to make this river look fast flowing. Tried a very complex node-setup from a guide, however I’m unsatisfied with the result (see pic) because I’ve made a mistake and can’t find it. The Problem is probably with the displacement modifier which does not seem to work. Either way, I want a more simplistic, low-poly way to give the appearence of a river, can anyone of you recommend me a setting?