First, Jamie T. Kirk. I would have used a bouffant like Yeoman Rand but I don't have one, so this seemed pretty close. The figure is really sexual with huge breasts. Also plenty of makeup, big dangly earrings, and tall spike-heeled boots.
Next, Dr. Lenore McCoy. She's not as sexy since she's middle-aged.
Finally, um, Ms. Spock. Anyway, not a lot of makeup or anything. I haven't really figured out how to make pointed ears but the hair covers it up anyway.
And just for the fun of it, here are the other main characters:
Scotty I made a little chunkier like the movie one.
Sulu has sword-shaped earrings as a reference to the episode when he went crazy and started waving a sword around.
Chekov is the youngest so she's a teen instead of an adult.
For some reason I don't have the male version of the uniform, so I used something close for Uhura. The goatee is a reference to the evil parallel universe where Spock had a goatee and the earring is supposed to be like the thing Uhura always had in her ear.