Many thanks. The level of detail I mostly owe to a thin umber wash (made from Miniature Paint Umber) applied over the whole model after most of the base coat details have been painted. See post #15 to see pics of the peacekeeper right after the wash had dried. I use this as an extra guide for the highlights.
I also use the tamiya weathering kits to add the final level of detail - rust, mud, soot etc