Ohhh this spell looks nice! 
If I were to cast this spell, I would add a bit of honey and sugar to the glass every time I light the candles. You want to build on the energy of the first session so adding a bit more ingredients to it helps do that. When the spell is finished and the candles have burnt out, I would consider doing one of three things → discarding the remains of the candle in the trash, burying them somewhere on my property, or placing them in a container to keep in our room.
Also, instead of using a photo, you could use a different taglock. The photo simply ties the spell to the two of you. Other options include a piece of paper with your names and your anniversary, just your names, your names and your birthdays, etc.