Well, I would not say that they will deny you just because you don't have wedding pictures. So to cover this part I would of sent a letter explaning why there are no wedding pics (stating reasons why you did not have a wedding and that you are planning to have one in the future because for this "reason" right you guys couldn't have a wedding party).And also in the checklist it requires that you send proof of genuine relationship...Make sure that you send every possible proof: phone logs, messages pictures, joint accounts, emails, gift cards, western union receipts etc