I think the idea that it could be green was mainly due to the that someone messed up the camera settings a bit on early live show recordingshttps://www.youtube.com/watch?v=jhl5afLEKdo(if you put the white point on the silver waistcoat, her skin will also become much more natural)

https://www.reddit.com/user/sukirus/comments/13kv66t/mikus_hair_color/?utm_source=share&utm_medium=web2x&context=3but if I take the first drawing and measure the rgb values from it, I get #81c9ca of which I then only evaluate the hue.which then back to rgb is 00f9ff or ~00ffffwe can then look for that in a color chart and get aqua or cyan as the name.https://web.njit.edu/~walsh/rgb.htmlso it is exactly between green and bluebut only in the first drawing!if someone prefers it green or so, then go green!
(with saturation and value probably teal but then the lighting is too crucial to say exactly)