All good art schools will have their students draw from photos, mine included.
I had foundation classes for 2 years, and in those classes we drew from life in class (people, objects, animals, everything was from life in class) and for homework we often did studies from photos. I have done countless myself, and it is VERY helpful. while drawing from life will always be the ideal thing to do for learning, not everyone has access to someone who can model for them for hours.
so yeah, drawing from photos is a great exercise.
aaa it’s inspired by Huldra! A male version tho.
Nøkken is in the story too, but it dwells in the lake and has no specific form.