I added lights and darks and the color. I used crimson red, indigo blue, white, grass green, dark green, yellow chartreuse, pale vermillion. I used a little scarlet lake in the warm red areas. I used white to smooth some areas and then re-added color. I paid close attention to the values.
I demonstrated adding light and dark to the background. I used white (could have used cream) as well as light and dark umber. I used the dark and light to make some things pop forward using contrast and some to recede by diminishing the contrast. It's still a work in progress. I added some yellow as well, may add more.