Someone suggested a golden brown, but did not possess any recipe. Dioxizine purple, ventian red, and burnt umber are good for shadows. You may want to use alizarin crimson instead of transparent red. You may also want to add a little raw sienna with the aureolin to get more of a golden look to it. If you want to learn about transparent layering o glazes you may want to get Salvador Dali's 50 secrets to a magic construction.
Realism is the goal.