White, but not white

 Shadowed whites can go in any number of directions: purple, blue, greens.

 

For the shadows of the white fence I opted for a gray-ish light blue-ish teal. There are spots which called for a cooler look so I mixed a bluer color to blend in to the main base color. 

The color gets darker on the pickets moving toward the bottom of the painting to convince the eye that there is less light. You will notice just under the bird the picket edge is lighter. So the pickets do not look flat, the lighter edge gives the feeling the pickets were painted with a satin or semi-gloss paint.