I really like her hair long, and I would like to see it really long like how Kaori's was.

I'd like to see it short just like how Rika's is now, but if that happened, then there'd be no more long hair. The more I think about it, the more I'd like to see her hair short(Called a 'bob-cut' I think?), but if it looks bad, I don't know how long it'll take to get that beautiful long hair back.

As for color, I think as long as it's still close to black, it'll look fine. Maybe something like Ayaya's. I think anything lighter than that may look weird, but I still wonder how it would look.
About that weird pic, I think it an actual photo and not a postcard. I don't know what's up with it though, if it is real.