Problem
I want to cut this model out from the background, the issues with this image are the hair which is very spikey and translucent in places. There are also places where foreground and background colors are very similar such as around the chest...

Solution
I didn't adjust any of the IIL settings for this one.
I started this image by masking the background which was fairly easy. There were some issues around the chest and neck with mask slipping over the edge. So I used the force edge tool...