Love the way the shading is coming along. That's the thing I need to work on to get a more realistic - no, I'm not really going for realism, but lets say more depth and dimensionality to my work. Pretty keen on your color scheme too. I've mentioned before how I do seem to be drawn to art in this palette, yet fail to use it in my own work. But I AM thinking about it.
This is fascinating Annabel. The colours are coming beautifully.