Shadows, Catchlights can give-away a lot about the lighting setup of an image. 

However I find shadows hard to read, so I'm looking for advice. Below each image is my attempt at deciphering the lighting- I'd like to know if you disagree.

Image by Jose Vieira
[![Jose Vieira][1]][1]
My guess:

 - Single-strobe, diffused. Placed 45 Degrees to the right of the head; I was tempted to say subject-right. However when I noticed the left-side of the leaf and the catch-light, I changed my mind.

 - Between the camera and subject vs behind the subject; the former, as the the exposure on the chin would be much lower were it behind the subject.

 - While the catch-light says soft-light, the structural definition of the leaf has me thinking hard light.

Image 2 by Jannico Kelk
[![Jannico Kelk][2]][2]
My guess:

 - Single strobe. Subject-left; totally unexposed jaw.

 - Hard-lighting; snoot, box/grid. To only light the tops of the snake, I suspect the light was pointed upwards. 

  [1]: https://i.sstatic.net/IMKKH.jpg
  [2]: https://i.sstatic.net/yyVwp.jpg