Earless monitor lizard wip

This is an acrylic painting on paper that I've been working on every now and then. I can get a painting done pretty fast when I have a good vision in my minds eye, but in cases like this one, the progress goes by a snail's pace. Something about getting the tones anywhere near I want them to be, or how am I going to paint the body of water has been giving me uncertainty. But it's getting there. Anyway, hoping to get this done sooner than later. I recently learned about a pretty cool blue-eyed lizard that lives in Borneo and I really want to have some art done on this critter.