This is going to sound funny, but once you go black, you don't go back. What I mean is, if you dye your hair black, there is no way to fix it except to bleach it, which will kill your hair! That or you'll have to grow it out. You seem to have long hair, so it'll take a longggggg time for it to grow out!
Personally, black is my favorite hair color. It looks like you have naturally blond hair, which is gorgeous. Considering your hair is fairly light naturally, I would suggest dying it temporarily, in case you really don't like it. I think either dark brown or black would look nice.