Smilies and metaphors are rather lower level language skills that don't really contribute to major ideas or themes. They're just stepping stones to achieve those goals.
First of all, all of those things that you listed are smilies, and smilies are so drilled into our head that they just come out naturally really. I didn't even count them as lit. device for part of the bonus when I review, because they're that common. They've been worked into our culture to just be part of our "normal conversation." Unless the similie is an oxymoron, contradiction or anything out of the particular, we really don't need to keep an eye out for them, even.
Metaphor is just as easy to write, but a lot more difficult to use a metaphor effectively, and is very often important if it is used effectively. However, I really don't see too many of them in use here.