Mimikyu Concepts

After playing with Mimikyu in Pokemon Refresh for the first time, I realized how strange its body must look like under the cloak. It eats Poke Beans near the "eyes" on its bottom half, but the Pikachu head seems to have full control over itself and can sense its surroundings, except when Mimikyu's disguise breaks in battle. I just had to sketch out some ideas for the mysterious little guy!

First design has the eyes on the bottom and a mouth, as well as arms that grow and shrink. I feel like this one is the most accurate (minus the growing arms perhaps), although I doubt we'll ever know for sure lol.
The second design only has a mouth, with disappearing arms.
The third design has a mouth, and instead of a head, it has a ghostly substance that allows it to detect its surroundings. However, Mimikyu most likely has a solid head since it likes to be pet on its Pikachu cheeks, and I suppose if it had a gaseous head that it wouldn't be able to enjoy being petted. It has disappearing arms.
The fourth design has eyes inside its head, which aren't really used for seeing and are more like sensors. It also has a mouth on its lower half and arms that appear and disappear at will, as ghosts tend to do.