@ Maria Holland
You screen is way to dark. Also, you really should not be relying on Max Foreground retention and Max Screen removal. Those settings can make the hair edges really hard. If you have to use those then typically something is wrong with the setup.
Also, in addtion to the screen being too dark, it’s really difficult to see the hair details. If you send me the full size original green screen images, then I can evaluate it in more detail and give you better insight.
You can send it to firstname.lastname@example.org
I won’t have time to look at it until later tonight though because I will be out most of the day.