As of the above photo, 112 of the 170 pixels (squares) are finished. My daughter is very excited about how it is coming along, and I am enjoying working on this. For background on this mosaic, see Stabby.
It is interesting to see how the various patterns reflect. In the photo at top left, the darkest square is an awesome spikey pattern made with Kismet tiles cut in slim right triangles, which are the offcuts from another pattern. The photo at bottom left shows a closer-up view. I don't think that this pattern will stand out quite so much when the piece is upright.
There is another pattern that is similar, but with smalti and not as pointy, and the pieces are more squarish, so closer together (shown in this blog post). The squares in this pattern also look very dark, very black.
I will be putting the piece upright soon, and will have a better chance to study the reflective variations from the proper perspective.
There will be a lot of finishing work to clean-up the squares. I'll be using a black cement colorant on visible thinset due to it being not completely black.
This piece has been tricky in dealing with such a variety of materials, all of varying thicknesses. I'm using a combination of raising some of the pieces with porcelain tiles underneath and controlling the height with thinset.
It's coming along!