Hair Shadow look rare

The hair casts a very strange shadow on her head, how can this be fixed?

Certain light schemes (like Blur_Warm) might be causing this. Particularly find a spot light which has a shadow with Enable PCSS turned ON and turn it OFF.
PCSS is a great feature to soften shadows further, but does not work well with transparency enabled objects such as hair.

Also could not help but notice those sharp folds on shirt underarms. You may need to smooth out skin weights between UpperarmTwist01 and Spine02 bones.

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Thank you very much, it seems that’s it, although I tried lowering the value and it worked.

Good eye, yes, the skinning is the default one, the pants and shoe buttons also are bad. Out of the thousands of Daz t-shirts, I had to choose the most difficult one to skining. I’m too lazy to fix it now. hahaha. I’ll see if I can fix it on the image itself.