A Few Adjustments

I've been reading more web entries about the benefits of using a limited palette, and am trying to figure out how to create more unity in a painting such as the one below, using fewer colors. I feel like a novice painter now. How would you mix those intense greens in the canopy? In any case, I tried using only four colors for the work I did on the faces today— Anders Zorn's palette of vermilion, yellow ochre, white and black.

Stockton Street, © 2017, work in progress (click on image for larger view)