Extravagance was always the best instrument that allowed head shot retouching become unique. But most of the models love their hair and do not desire to change it permanently just for one and only photo shooting.
High end hair retouching includes:
• Stray hair retouching
• Removal of the hair that flies away
• Cross hairs removal
• Fill with hair some spots
• Shiny effect for the hair
• Hair toning
• Dodge and Burn effect
Stray hair is perfectly removed with the Healing Brush Tool in high end retouching in Photoshop. The same is true both for the fly-away hair and cross hairs. In case with the crossed hairs we often use Liquefy, just like with the hairstyle in the whole, because it makes it much easier and look more like high fashion retouching.