What i always do is 1. put them on something else, you can be creative with it, try on a mirror, or a plexiglass sheet with light under it. If that still doesnt work, i know that when i hold my snakes for a long period of time they get really calm and stop moving a lot. hold him and let him slither over your hands as much as he wants, eventually he will calm down, then have your wife take the pictures. Or, she holds him, and you take the pictures. Just make sure that it is a snake friendly environment, no fast movements, no running children or dogs, etc. etc.