Try Print Prime Lite:
https://itunes.apple.com/gb/app/prime-print-lite-printing/id842484904?mt=8
It works with many AirPrint printers. If it works with your printer, and does what you need, get the paid version, because this one prints watermarks on your files.
I've searched both the Forums and the Net and cannot find out how to print photos full page. I'm on an iPad Air printing to an HP1102P wireless printer.
Just trying to print a photo larger than 4x6. What am I overlooking?