It's significant that Finch chooses to leave “make it lovely” on Decca’s pillow. Telling her to
make it in particular suggests that Decca has control over how “it”—that is, her life—turns out. In other words, Finch purposefully chooses words that show Decca that she has control over how she sees and responds to events in her life. But Finch struggles to take his own advice: though he wants to give Violet only happiness, he seems unsure of how to “make it lovely” for them. And the growing sense that something is wrong also ominously suggests that Finch’s mental health is starting to decline.