While the first pic looks really awesome as a picture, I always try to take pictures that accurately reflect the snake, especially if I'm selling it. So just something to keep in mind IMO.
As for your second one, it's over exposed. What are you using for a light source? Flash, light box, lamps, etc?? Especially with white snakes, its easy to have too much light wash them out. What I like to do is to bounce the flash off the ceiling (using Nikon D40 with SB40 flash), with just normal lights on. That really just illuminates the room and your subject without blasting it with a bunch of light.
Here is an example of the bounce flash on a BEL I hatched a few years ago on black background. This one is probably a little underexposed, but you can still see the detail of the scales, while still giving an accurate idea of his coloration.
All this being said, I'm no expert, have never taken a photo class, but have just figured things out with a lot of trial and error and reading around.
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