I have a question about how to make consistent characters in a prompt. I want to make two specific characters interacting. My example prompt is below. But the generator keeps mixing and matching the appearance of the two characters. I specify different hair or clothing colors for each, but sometimes both characters have the same, mixed, or reversed colors.

How can I write the prompt better?

Charlotte (slim adult human woman, grey jumpsuit, long blue hair, smug smile) is laughing at Kristin (adult human woman, green dress, short blonde hair, embarrassed blush)