I know the lichen is pretty bright around waterfalls and because of the darker green at the top I will blame the lichen for the brilliant green. You could have done with a couple more shots of overexposure to bring those shadow up. Nice job on the water. Even the splash point isnt blown out. The rainbow should be more reddish than brownish which is probably from your processing. The composition isnt bad but its a bit cramped for the scene. Out of 10 Id give you a 6.5 on your processing.