Gradient maps are not plug and play, sometimes they are when you have a good range in values, but often times you need to adjust things to make sure you place the right color into the right value

i use Proof Colors to check the values that i painted vs the values that are appearing from my gradients
you can see whenever the sliders are spread evenly, the gradient is not working with the values that i painted because they're mostly on 1 side

Blending Options (didn't use this for her, just wanted to show)
use "Alt" to break the sliders to smooth the blending, great way to add more color
working on a Hue/Sat layer, at the end just adjusting the sliders on it

Median Filter, it helps & blends the surrounding pixels based on brightness
helps & cleans up some of the edges around the masks & harmonizes my colors when i get a bit over detailed & too contrasted