I was also doing an acrylic of the same image at that time. (You don’t see it onscreen. sorry about the audio referring to that demo). I might put up a photo of it later. I use FW Acrylic Ink for the white highlites. Chinese white may work also, thouogh not as opaque. Below is the finished image (colour is better than in the video).and a typical waterfall illustration showing the PARTS of a WATERFALL. It is important to ‘articulate’ all the parts in the typical falls. I find it kind of liberating when I analyze things that way and then they become like steps in a dance.