I don't think there's anything wrong with having all face. I just think of it as a close-up in a movie scene. Signatures don't always have to look for the big picture.
I like the first one and it's effects, but I don't know how I feel about the circles. It's a nice concept, but I'm just not feeling it. Also, her feet look a tad too erased. As for the spot light, i think it should have a more cone-shaped feel to it since thats how they look in real life. In your signature, it looks more like your focal is being abducted by aliens, lol.
I like the second one a lot more, like I said, I don't mind having signatures with all face. I do it sometimes myself. My favorite part is the smoke over his eyes. I do feel like the colors are a bit too strong, but this is coming from someone gets the "the colors look washed out" critique on every single one of my threads, lol so take my words with a grain of salt.