T.H.
I've had the low resolution problem when I used pictures that were dowloaded from websites or my email, but never with my own photo, so that's kind of weird. I usually fixed it by changing the size of the photo on my book page, making it smaller. I'm sure if you have the original there would be a way to fix it. Do you have a photo program? I would try that and you'll probably have to re-save it and then upload the new one back onto Snapfish separately. Good luck!