JF my hair isn't as curly as yours and I have short layers. My shortest layer isn't even to the tip of my nose. It's just a bit past my eye barely. I should have been more specific, long layers are fine, it gives my hair enough length to spiral but the shorter layers don't always do that. Some do but not as often.
Now if I had curlier hair like you that might be a different story. I don't know I had my hair all one length when my hair was curlier at puberty.

Boy I'm scared for you to make a change, I love your hair like it is now. But ya know long layers would be easy to grow out if you don't like it and that's waaaaaaay different than short layers.
2c/3a?
Low porosity, medium texture.
http://public.fotki.com/Medusahair/

If it smells good put it in your hair, if it tastes good spit it out!