On the sale of my novel to Harper Books

I sold my novel to Harper Books! It happened pretty recently and I'm still absorbing it. I’m working with a wonderful editor there on revisions, going deep into the world of the book—again. I'm working on two characters in particular and I'm thinking about: What makes a character rich and complex? What is the intersection of plot and character where a plot can have momentum but a character in that plot can remain mysterious and surprising? I think what I am searching for are the elements, the alchemy that can produce grace. Which which brings me back to the very beginning of this project--the thing that compelled me. What are the ways we seek grace in our lives? And, how can we deliver ourselves from the possibility of not receiving it? (Still figuring out what I mean by that last question!)