My wifes sister (Trine Henriksen) took the picture, and said that it was OK to releace it to public domain.
This image has been (or is hereby) released into the public domain by its author, Trine Henriksen. This applies worldwide.
In case this is not legally possible: Trine Henriksen grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.