You're not done yet? Lol looks great so far believe it or not, i did all my carving with a steak knife, exacto and a scalpel. Oh, and you can always silicone/ cocofiber that bare spot directly onto the glass.
I know, it's taking forever. I am hoping to try out the waterfall tomorrow to see how the water will flow. And all the bare spots will be covered with silicone and coco fiber