Some more atmospheric lighting would go miles with this. I can't see anything in the image, well it's hard. Too dark.

The neon in the back is almost too overpowering,but provides no actual light. It's weird.

From what I can see looks good

I like them. My favorites are the ones on the far left and far right. I think it would do some good to diversify the horror factor; instead of sharp teeth, maybe have a too-big set of human(ish) teeth. This example would be best on the far-right one, since its eyes are already pretty freaky. Making some of them more uncanny would go a long way for you. Looks good, though :-)

Too dark, can't see creepy.

Dial it in if you want creepy vs. scary. Make them mostly normal with an uncanny feature or two, and make those different for each one.

The post below about putting human eyes on one is a great example.

They are pretty creepy! I think just one of them would benefit from extremely realistic human eyes, just to throw off the viewer, in contrast to the clearly plastic/fake eyes in the rest.