Probably one of the big downsides to shark vore for most artists is that it’s hard to think of sharks as a “swallow whole” type of predator— You’d mostly think of gore and tearing and blood, and let’s be honest, the vast majority of people who are into vore would still be turned off by that. If you like that, you shouldn’t be needing to ask in the first place given the amount of shark hard vore in movies and other media (for example, this neat movie called Jaws). Personally, I like the idea of soft shark vore but it is indeed hard to find. All I can think of off the top of my head is: a.) a Ninjartist piece with Emma Watson, and b.) some thing of a shark with a pregnant woman in its mouth that I know I’ve come across a couple of times somewhere.
Unless you are fine with “furry” anthro sharks, in which case your selection is still pretty limited but at least there is some stuff.
Honestly I suggest you make your own; sharks have a pretty simple basic shape and are easy to draw, especially with a reference. Just give it a big bulging gut and, if you can manage it, an internal. Boom, your own custom shark vore.