I don't think you need much when you have an alien holding a Tommy-gun. This may not be what they looked like in the actual episode, but I can imagine this working in either the Gold Key Comics or The Animated Series. I consider the two mediums to be part of TOS world.
I re-imagined the Iotians as shape-shifters. My interpretation is what I imagine them to look like still dressed as 1920's gangsters. Even if they don't shape-shift, it's nice to have that in the back of your mind while watching the episode. The phaser-Tommy gun melds the two eras together.
Once I started to add the shield, I knew it would be a good way to include an element of the Enterprise.
The stacking [of the text] was meant to evoke a roman column without actually illustrating one.
I didn't think that I would get the chance until I came to this episode. This is one of maybe two where I paid homage to the red-shirts.
The opening teaser seemed interesting enough to include in a poster. The flag was added because of the episode’s story line. I think if you're unfamiliar with the episode, this image should spark some interest in viewing it.
This one went through several rounds. I originally wanted to go with a romance novel type of illustration. I decided instead to focus on just McCoy, since Spock and Kirk had gotten their own posters already. Rather than focus on the negative aspect of McCoy's illness, I chose instead to celebrate his marriage and cure with a colorful rainbow effect.
The black and white image [of McCoy] avoids getting lost among all the color and fancy lettering going on around it. In keeping with some of the love theme, a novella is what the Latin soap operas are called.
The full set should be popping up with retailers soon, as will the usual glasses and T-shirt versions.