Using these deadly pencils again ? you always suprise me with them. I see photo ref, I guess you dindt change light a lot, not the way where it goes. it looks you just made snake's skin darker, it looks better on first sight but if you look clearly into whole mass of its body looses depth a bit, because contrast between light and dark on scales are close to contrast of whole mas of snake is, if you darkened skin you should make darker deepest whole mass sshades too. (but not every insane looks on it deeply and do not checks every detail and do not compare it with reality, so I guess that much details are really not needed XD). Not every scale is regular I prefer doing it irregular because its more natural.(humans doesnt have both arms same too even they looks like.)

Structure of textures looks amazing, really reminds soft scales with low deformation while growing.

So ..i dont care about if it what you draw is really same like on the ref, its better to do it in your way and train and learn you need instead forcing yourself to completly copy something, you gave it its own life. Artists are gods, they are giving life to their pictures. If they can awake it to live, it means they know what they do, and they do it for themselves.

I can see it, how it moves.