Misha - Hmmmm ... never had this situation before. Normally, I'd slap a circular polarizer on the lens first to pop the colors a bit more, but that will probably minimize some of the sparkly mist you want to capture. I don't know how well you'll be able to capture the sparkling mist with the shutter speeds you're going to need to use to get good detail in the rocks and parts of the shot that are in shadow. Have you tried going for even longer exposures? Try adding a 2-stop neutral density filter and then taking two shots (one exposed for the shadowed waterfall, one for the sunlit area). I have no idea if any of that helps, it's out of my knowledge-base. -=>Donald