That is a very creative pose.
BTW: You probably shouldn't use pinterest for reference photos as they are often agressive about copyrights.
Copyright laws give the copyright holder of ownership of derivative works which would include drawings based on the work.
This puts artists in a situation where they have to negotiate a contract with the creator of the reference photo to get permission to draw the picture.
It is a big hassle.
I would seek out stock companies that use the creative commons license. The creative commons license gives artists the right to create derivative works.
You can also use public domain photos.
!WINE
RE: DRAWING OF A BOY SIDES VIEW ON BLACK PAPER