What really does it for me on that specific snake is that the spine stripe has boxes jutting out from it, breaking it up. I typically don't like the striped look on snakes, but that one has enough variation that it doesn't really look like a stripe to me. Is this a common thing with them, or is that a somewhat rare pattern? Nanci's snake has it where the tail hangs down over the box, but the rest is normal stripe. Google searches for them tend to result in pics with normal stripes as well. Tessera's cost roughly $8,000,000 each, so I won't have one any time soon, but it's something I'm gonna be following.
Pic I made up to try and illustrate the boxy stripe pattern: