the third and first are good. the fourth is nice too. my favorite is the third. i really don't like the second, i think it is too light for you with your skin tone. but i think the third would look really nice :)
If you're going to go blonde, I would say you should definitely choose the 3rd one. You already have dark hair, so you could maybe do kind of an ombre so that it won't look weirdly fake. You're really pretty and with that hair, going blonde would for sure be change but I bet it will look great!