We did not submit much for AOS. By the time our interview was scheduled though, we had AMPLE evidence of marital life, financial commingling, etc.
Send what you have now, and then set about to get both names on household bills, leases/titles if applicable, joint insurance, name spouse as retirement account beneficiary, etc and then of course file your taxes as MFJ. USCIS realizes the evidence for K-1 AOS will be scant, so they expect you to bring it to the interview, plus submit subsequent evidence with your ROC when time for that.
Btw, we did not send any photos whatsoever. We eloped and just had selfies for our wedding, but the immigration officer asked to see them at the interview.