Help identifying a snake.

[ZigmaS]

Hi!
I'm totally new to the forum and the snakes community in general. But I love them!

I'm an artist/sculptor based in Barcelona/Spain and right now I'm working on a new project that contains a full size snake on it. I've been searching for image references on species that I like morphologically speaking. I've come across a lot of beautiful species, like the Atheris hispida that has a really interesting scale structure, or the Atheris chlorechis that has a head/body proportion that I really like. But any of this species has a body mass, head shape, scale texture that totally fits into the sculpture that I'm doing. Until I found this picture. This snake has the perfect head shape, body mass that I need! But the species of the snake on the pic is nowhere to be found, I've crawled the web trying to find the original post of the pic to get it in context, I've even tried looking to a lot of especies and comparing the head shape to find the right one and get more details/references on it to work... With no luck at all.

Can anyone identify it by the picture?
I really hope someone can! I really want to be faithful to the snake nature.

Thank you all very much in advance!