I've worked into the 3 silhouettes, I didn't spend as much time on the other two as on the first one, since I'll be refining and changing the design anyway, but for now I think I'll go with either top or bottom left, or come up with something that has elements from both.
I especially like the idea of having the eye on the tail, so that the eye can continiously scan the area for potential threats. The eye on top of the head, to scout for birds of prey is also a cool idea, but I'll most likely go with the tail as it gives more range of vision.
The bottom left also looks like its better built to run from predators, but I'm actually liking the top left, because it looks like it could fit in the most in the environment I want it to be in. The insect one was a bit of a failed experiment, didn't enjoy making it at all and rushed it a lot.
Will post more soon