willow green for grass
grass, nile, and emarald green for trees
flesh blush and brick red for colorful trees
buff and a couple of diff warm grays for site elements
cool gray #5 for shadows
a blue for water
Then I have a bunch of pencils that I color over with.
I created the above chart for my own use a while back when comparing large format scanners available at different print shops across town. Most of my rendering occurs in Photoshop today, although I use digital versions of several of the above colors. A few brain droppings about hand rendering: