Getting consistent aliens is really hard. Got some images I really liked so made a alien LORA where the aliens will looks at least pretty close like they came from the same race. It's pretty flexible and handles specific details if you want.

Suggested Strength: 0.6-0.9 Lower more flexible for your added details. Higher more in line with the source images.

Should handle lighting and various poses pretty well.

Keep in mind the style and context of the picture can impact how the alien looks. Horror vs Science Fiction, etc.

This race does like to rock out with it's cock out so keep that in mind.