Your white balance looks off to me. It's different in each one. Getting the correct exposure is pretty critical when shooting on white too. Your light is bouncing up and spilling over onto your snake.
You can buy a card for less than $5 that is 18% grey. Most cameras have a custom white balance setting. Use the card to set your WB for the shoot and you are good to go.
If you use any type of photo editing software and correct your WB in post it works just as well if you shoot RAW.
I saw that you were in Program mode according to the exif data in your shots. If you can set your camera to manual it will keep your shots consistent from one to the next.
I suggest setting the whole thing up, taking a few test shots to check then get your subject ready. Snakes, kids, models it's all the same. They lose interest when you are fiddling around with the camera.
White is hard to shoot on. I was going to take some shots of one of our little snakes tonight on black, I'll post them up if you are interested in seeing them.