The Lady with the pet Bats
Is it sinister enough, how my lighting? I'm trying to have the key light from behind...
However if you want any kind of rim light, you need to move it over a little bit. If it's directly behind your subject, it will only be blocked by the subject. Light travels in straight lines and doesn't wrap around your subject.
For more sinister, I would try more lighting on the front to the side, either high, or very low for a really scary look that will create shadow, remember you need light to create shadow.
Oh awesome idea's as always. Thank...