A:AnswerEpson does not have a dedicated photo printing software. You can however use any number of free full featured photo editing and printing software such as Irfanview or GIMP. Both do a great job.
A:AnswerDoes it print normally via USB and/or Ethernet? You can eliminate a lot of possibilities by printing from a normal computer with the driver installed that came with the printer. If it prints normally via USB or Ethernet, then you either have a driver/protocol issue with your wireless device or a problem with the wireless set-up. I purposely do not use wireless printing directly through the printer itself. People can connect to it wirelessly through the normal wireless router protocols (wireless to wired Ethernet via router).
I had a similar issue when trying to print from my Linux (Ubuntu) computer via standard Ethernet. A few odd black characters. After installing the driver via Ubuntu protocols, the printer works fine.
My guess is you have a driver or wireless protocol issue--not a printer problem.