This was the cover for the Young Miles omnibus from Baen Books. Lois' manic-depressive space opera protagonist, Miles Vorkosigan, has two sides to him---on a good day. It came to me that using a playing-card theme would be a great way to reflect the Manic, enthusiastic and Depressive, somber sides of Miles.
Trivia: The knife he is holding used to be his grandfather's.
I worked with Lois on the GURPS RPG supplement based on her books, but had to give up the project due to illness and injury. She's a neat lady.