It would appear that you are going for a professional look. In that case I would avoid the pics that have you looking casual. the first and last set are the most professional. Smiling in the corporate world is not a great thing. You want to come across as strong and reliable. that's why I would def go with 51. It looks strong, caring, and capable. it's the pic of a person that I would choose to sell my home and handle my finances.

I'm assuming that cuz of the need for choosing it now that it is business related. I'm really sorry if I read that wrong and you need it for a christmas card or such. I would still choose the pic even if it's meant to be casual just cuz of how it comes across.

good luck to you! You are a good looking woman.