I always choose to look, as much as one can, at the supernatural not being something that exists outside of nature, but a deeper, fundamental heart of nature that perhaps humans have lost touch with. It's a more primal thing than perhaps we are attuned to in our modern, self-aware way of life.
A lot of times, the choice of the right song will save a scene. Or there will be a scene that's a little flat and you put in the right song and somehow it just comes alive.
It's easy to look at the vampires as a metaphor for any feared or misunderstood group. It's also easy to look at them as a metaphor for a shadow organization that says one thing and has a completely different agenda on their mind, and anybody who gets in their way, they just get rid of them. Does that sound familiar?
As a writer, it's fun to create. And once you get into a long-running show with very established characters and a very established tone and format, after a while it's a really great job, but that's what it is - a job.
Ultimately, physical resemblance isn't as important as whether this person can bring this character to life in a way that's compelling and makes me care about what happens to them.