Nice pictures. Hopefully I can give you some suggestions. I would definitely get a tripod if you want clearer pictures. Use a low ISO if you have the light as well as a bigger F-Stop (smaller aperture) as light will allow. As far as the blue, you can try to change the white balance on your camera settings or you can use photoshop to change it after. One method in photoshop elements is to use Enhance>Adjust Lighting>Levels> then select the white dropper and point it to the white surface. However, it might be difficult to use that technique with a white snake. You may want to take pictures of those snakes on a darker or black background.

Good luck!