Two of my favourite colours mixed together on the paper are Burnt Sienna and Prussian Blue so a I decided on those for the coat and a mix of Cobalt Blue and Indigo for the jeans. I used a touch of Alizarin Crimson for the bag but apart from that used only the blues and brown. I could have used any colours at all, I was only looking at lights and darks not colour and maybe on a different day I would have chosen an entirely different palette.
With an image like this it is a good idea to keep the lightest lights white even though we can see there are no real white areas. Keeping a few whites really enhances a painting and lifts it so you will see there are a few whites left on his hat and jeans and odd little sparkles around the painting.