You might set expectations a little better on your website by telling people that it's going to take a while to actually get their prints.
Improvements or suggestions
Your shipping options suck. DHL? Really? Please let us choose better, more responsive, more competent and faster delivery companies even if it costs more money. What about letting us pick the orders up from the Museum Shop?
I'll come back and increase my rating if DHL actually delivers the package when and where promised, although I expect them to somehow manage to provide their usual suck level of customer service.