Photos aren't necessary for filing your AOS packet but are good to include, since the immigration officer will have reviewed your application materials prior to the interview. He/she will have some impression of your marriage due to this. The stronger the impression, the more smoothly and quickly your interview will proceed. The interviewer has limited time during your appointment to collect and assess new material. I wonder if sometimes, people aren't approved on the spot because the immigration officer finds it necessary to collect new evidence brought into the interview and then has to assess these afterwards.
My husband and I sent 10 annotated photos with our application. We are going to bring those alongside more recent photographs to the AOS interview.
What type of application are you doing? Regardless of it, always send pictures. Make sure to print doubles, one to send and one for you to keep. Whichever type of petition you are sending, always make a replica of it to take with you to the interview. Goodluck!
