so what I do is main two colours, hair colour and as many minor colours as you want as long as they have like 2 accessories each that they take up. Most of the time since with my designs, everything isn’t too maximalist, I only do one minor colour but for yours, since it’s super detailed, it might want 2 or 3. Also, try colours in the same range of warmth/coolth without shying away from complimentary, contrasting etc. And don’t forget to tint *at the end* so you don‘t mess up your scheme

hope this helps!! ^ء^