This is not much of an update, but what I have done is to add the darks to the bottom of the painting. I used Black and a Dark Brown. Then I took the stencil brush (I have a whole bag of inexpensive ones) and did some "pushing and pulling".
This is a term we use in our pastel class..where you lighten/darken, soften/harden, give some shape to... One area where you might be able to see this is in the left hand pear. I have used the stencil brush to pull some of the dark color to vaguely create the shape of the pear and push the color on the dark side of the teapot.
This should give me some color harmony, and I can control the softness of the darks that are going on the teapot. I don't want any hard edges where the teapot rolls into the light. So I'm going to try to do it with the stencil brush.