another vote for bottom right and 3rd sketch.
I think if you tightened up the third sketch, perhaps digitally, it could have a much more powerfull impact than the finished image
that sketchy illustrative style really speaks to people, it's got a power and a certain intrigue that you can't explain....works well.
BUT if you "client" wants one of those finished ones on the bottom, I'd go with the bottom right....DON'T use the green, it makes people look sickly and dead.
anyhow...hope that's worth something.