He's coming along much faster than I'd expected. I thought the mosaic was going to take forever, but it's really moving along quickly. What's hard is the uneven surface. An unnoticeable bump on the concrete surface becomes huge when you're trying to get a nice uniform finish on the mosaic. And that's a real pain because uneven tiles make for sloppy looking mosaic.
Something to keep in mind when I make my next one, try covering the piece with a smooth slurry. That might help.