Angry Little Pony

I was sorting photos on my PC, and saw this one...
What a cute girl, why she is looking so irritated? I also don't know. I took this photo when she was walking by, so she even didn't know about that >_>
But her outfit was so pretty (especially that pink pony-bag...) that I couldn't stop myself...from..taking...photo ;_;
I think we will never know what was the reason of her unhappy look... Who can guess?

Photo by me

UPD. Message to people who write that she did not give me permission for posting. I took this photo on anime convention, the place considered as the place where you HAVE permission to take photos of people in costumes, without asking them personally (if you are not sure, I am lawyer, and I am sure that I didnt break law with this.). Of course if she was just walking on random street, I will never post her photo without asking.

UPD2. Wow, I've got my second DD Thank you all, I am really happy =w=