It's another clear win for Poseidon.
Newcomers Freya (G) and Apollo (A) didn't work any magic. Newcomer Goddess (F) was unable to tear votes away from Cleopatra (D). Newcomer WWJD (B) actually got 4 positive votes, but also 2 negative ones; similarly, old hand Let There be Light (E) garnered 4, but only lost 1. Poseidon (C) remained ahead of Spring (G) in the out-of-copyright-cartoons-from-Punch category, and is the overall winner.
Thanks for your votes, folks! I shall now work on different looks for the Poseidon cover and put that to the vote, too. Although I'm good at technical drawing, I'm hopeless at anything that doesn't involve a ruler and set square, so whatever you collectively decide is guaranteed to be better than anything I could have concocted on my own.
Oh, I nearly forgot! I'm thinking of changing the subtitle from "A Guide to Conduct for Would-Be Deities" to "A Guide for Would-Be Deities". Does that work better?