Later: Some (better?) examples:
I have written about this blue effect and its possible relationship to the optical “Tyndall effect” here.
4 Oct
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Julian O'Dea 
Posted by hearthie on October 4, 2017 at 12:20 pm
Just the photography. Look at her hands.
Posted by Julian O'Dea on October 4, 2017 at 12:43 pm
Yes. Perhaps. There is blue lighting. But it seems to be picking out something blue in her skin, for example on her forehead.
If there is an optical effect, it will likely vary with the incident light.