I started with the cover model. She is Heather Heffken of Hedda Cothing, fashion designer and all-around fun person. (She's also my husband's cousin.) She let me play with the photos from a recent photo shoot. The first cover is based entirely on what I read in her expression. The following covers are what developed from there, matching shots/expressions with the titles that popped into my head.
Will I write the stories? Maybe. I'm seriously considering it. If I do, they won't be about literal angels.