Monday is just a few hours away so your pictures will be delivered. Now about the Escrow, how do we pick whoever is to provide the service? You may trust them, but how do I trust them? And if we really need to go that way then we also need to agree in advance on a third (fourth in this case) party arbitrator, since the escrow provider is enjoined in the transaction, and the laws that will be applicable to the transaction(s).
In this case ESCROW must be chosen between people who are really trusted. In this forum there is lots of people like that. Like DannyHamilton, or tomatocage or canaryinthemine.
Your trust towards them probably means nothing as you are the one who asking for business. They well established and i can be shure they have more btc than this escrow will be about.
Why not send taste to 3 different people to prove you serious, that postage will not make trouble and to make sure your stuff is genuine?