The cover art for Servant of the Underworld:
Isn’t it full of awesome? (some stuff might shift around a bit, but overall it’s meant to be pretty much final)
For the curious, the central design is lifted from the Calendar Stone. It represents the Sun God along with the Four Ages of the World, which makes it pretty appropriate for the book (I won’t say why because of spoilers). You can find explanations on the symbols here (scroll down a bit for the first ring).
Now I’ll go and have that much delayed dinner…