I recommend indicating "blue skin" at the start of the prompt. The program will occasionally try to "correct" the skin tone to a natural one but the blue skin is fairly consistent. The solid black eyes are trickier. Pairing this Lora with one that enhances details may help.
This is version 2 of my attempt at making a Lora that creates my Sherri character with her blue skin and solid black eyes. It is still very much a work in progress.
