I like the hair on the image on the top left, but it's messy in places and you gave it a lot of detail, this could distract from the emotion.
If you compare it to the bottom left, that image has a lot of structure in the hair, it's very easy to follow how the hair flows. there is a lot of detail, but the contrast between the individual hairs and strands is so little that it doesn't distract at all.
on the top right the hair is difficult to follow because it's again very messy, but also because her ponytail (or tail) seems to come out of nowhere.
It looks like you are trying to make hair look natural by just making one strand go left and the other right, but it's just all a mess. even under wind, combed hair wouldn't go like that. I think you should consider flow in your hair. giving direction to your hair as a whole. basically, that's the biggest difference between the upper two images and the bottom left one.
the one on the bottom right has just too much hair on the left side, idk where it comes from but it feels weird to consider it part of her hair.
aside from that, there is just not much saturation which makes the hair seem dull and lifeless. it feels like you used green for the shading of her, maybe try red. otherwhise just imagine a second weaker lightsource abouve her head as an excuse to put more light and color to her hair