I painted this on a light blue Fabriano Tiziano pastel paper. The blue comes through a little on the snow. My colors were Prussian blue, Brown Madder, and titanium white. There is a minuscule touch of lemon yellow mixed with those colors to get the light bulb.
I wish I had deviated from reality more and positioned the street lamp a little further left and the tree further right. Anyway, here’s a closeup: