leciga

I am in the same situation.
I applied to Remove Conditions in February and have been married to my husband (same-sex marriage) for 3 years already. I filed in Vermont, so we still have not heard anything back.
Last year my husband got into a medical school in the Caribbean and I decided to stay in New York City, where I work and live. I did not want to move to the Caribbean with him because I would have had to interrupt my career (I work in the entertainment industry and there is not much of that in the island where he is staying) and I could have potentially lost my Permanent Resident status by living abroad for two years. So we decided to do a long distance relationship until he can transfer to a US school in 2017. We see each other every time either one of us gets a break and we talk every day on Skype/phone/text. Our financial and emotional lives are extremely intermingled.
When I sent my application I also sent a letter to USCIS explaining our situation. I wanted them to know everything up front because I would rather avoid a situation in which we are called for an interview later on and then we disclose this information and it seems like we were trying to hide it. In our opinion there is nothing wrong with our arrangement and our marriage is real, so we don't want to come off as 'sneaky' or like we have something to hide. We also sent affidavits of our families and friends attesting to the veracity of our relationship and living arrangement.
Just tell the truth. If your marriage is real, then just be straightforward and explain your motives and your particular situation. If you hide things and they find our later on you only create a halo of suspicion around you.

Actually SOME types of photos can be very helpful and convincing. I'm in a same-sex marriage and during our interview we gave the officer photos with both pur families and some photos of me with my husband's grandmother and great-grandmother. The officer said: "If the grandmas approve then I approve too" and she approved my application right on the spot. The fact that we are close to each other's families convinced the officer that our marriage was real.