I have my hair cut just like this only a bit longer and I love it. I cut it to my chin before and I didn't like it. My best advice is to go to your shoulders the first time, and if you really like it, then go back and get it cut some more. There's nothing worse than getting a haircut you hate and waiting for it to grow back out.
BTW, you are sooo pretty!
*EDIT*
I love your new hair! I didn't realize you had already had it cut. Silly me for not reading through the whole thing! It looks really good!