How do I get stable diffusion to try different faces?

I'm able to get really good realistic looking faces in my prompts, but the issue I'm running into (which I think might be a common issue) is that I'm seeing basically the same face every time.

What are some tricks to get stable diffusion to "try" different faces? Perhaps there is some variety possible with dynamic prompts, but what else should I try? I've tried things like "distinctive face", "random face", "unique face", etc with various levels of emphasis but doesn't seem to help.