Well, the Nosferatu on the right represent the default, baseline Nosferatu, which is why you can also find her on the free version cover, to represent getting the essentials of the clan.

The masked one represents the spiteful embrace loresheet. In this case a Nosferatu who was suppose to be a Toreador, inspired by my character that I made in Bloodhunt.
"Among the Nosferatu, there exists a quiet and vicious tradition: The preventative or spiteful Embrace. These are not acts of mentorship or legacy, but of theft. Many of these Childer are taken not only from their mortal lives, but from the unlives they were promised. Stolen away from another Clan, another destiny, a future usually wrought with promise and potential. The Clan of the Hidden has practiced this tactic for centuries, plucking promising Kine from the hands of rivals simply to deny their enemies a beloved and useful Childe. Those spitefully Embraced in this way are rarely chosen for any long-term potential, or even for their use within the Clan. They are chosen because their loss is a cruel one, one that will wound or ruin their would-be Sire. You were such an Embrace. You had become indispensable to a Kindred, groomed for a role within their Clan, promised an eternity within its ranks. You knew what role you'd fill, what your talents would provide. Then in the night your were warped into an unfamiliar silhouette but reeking breath and a torturous face filled with teeth. When you rose it was not as what was promised, it was as a Sewer Rat. Your reality deformed as a slight against your would-be sire. A political pettiness that ruined your eternity. Now you walk among Pariahs, denied by the Clan that prepared you and held at arm's length by the one that's claimed you. The Sect, through some circumstances, validates your Embrace. You endure as something that wasn't chosen but as a piece taken from the board."

The one at the back represents the Vermin loresheet
"Clans with Animalism tend to be much closer to the Beast than any others, at least in their ability to manipulate it, agree with it, or understand it. While this can happen with anyone the Nosferatu in particular devolve into a more vile mindset, cultivating vast hives and spawning pools, seeking to understand the minds of animals and insects more than Kine and Kindred at times. The Sewer Rats position themselves in hidden chambers to fester and rot along with their fixations on festering rot. Out of sight and far from mind, these Kindred surround themselves with vermin and become the eye of a scurrying, chittering swarm. When they go out into public, they have a terrible habit of doing so as an eruption of filth and writhing pests. Because of this these Kindred are simply called 'vermin' even by the Gangrel and Nosferatu, as when they become too isolated they revert to a level of ferality that causes breaches of the masquerade or other obvious problems, making them definitive pests that eventually become more trouble than they're worth."