So I've been browsing around in my huge portfolio and I found this one, this particular one has a memory attached to it - A very sad one. So that is why Chie looks so sad, I still love it though...
Ps: Yes, she doesn't have the "ears", I think for some reason at the time I wanted to make her more human. Also keep in mind that this is MY way to draw Chie so she may look a bit different from the original one.
PSS: I apologize for the bad quality on this, my scanner has something against me.