Thanks for the reply, Aeros4! Not much to cover as far as post processing. The original image is an existing light night shot -- f/7.1 at 1/25 sec, ISO 800. I adjusted darks down a bit and increased neon lights up a bit as well. I also increased contrast slightly in the lights. The castle guard photo was a daytime shot. After selecting him using the lasso tool, I refined the selection to keep the detail in the border of the fur hat, then imported him into the New Orleans shot. Since it was a daytime shot, I decreased exposure to keep it from looking unnatural and overpowering the night shot on Bourbon Street. Other than that, I painted out one ugly electrical cord and decreased the exposure on the man's white t-shirt at the extreme left of the photo so it didn't detract from the main subject.
I hope that helps -- I started in photography on a camera that you only see in museums now (over 50 years ago), but I'm pretty green as far as Affinity Photo goes!