First let me say the animals are gorgeous. So this is not about them or even the quality of photograhy. But since you asked, I think that the same color does not work for all. I think the Bunchi and Tiger "Pop". But the rest are kinda "meh". If you can use diffeent colors try something complimentary to the primary colors of each snake. On the Enchi Queen try a Tuape or medium Brown. On the Crystal try something in a green hue like a deeper Sage. For the Pied its a little tougher because you are trying to provide contrast to light and dark. Maybe a Slate Gray would look good. Just my .02