Mosaicing the Crenels

We bought a new batch of blue tiles like the roof tiles, enough to mosaic all the Crenels. I thought it would be a lot easier to mosaic the Crenels in the shed rather than on a scaffold in all weathers. Being a compound curve, they are quite tricky to mosaic. The back circle of the Crenel is a dark blue to enhance the depth of the Crenel. These circles I can make in the cottage any time I get a chance.