I think you have to upload a photo regardless, BS... although I don't have a PSC. Anywaysanall the photo has to be taken in the last 3 or 6 (can't remember which) months.
I went to that chemist, erm and got the digital version of the printed ones I got for a fiver for my ADI permit. Strangely, the digital one (emailed without the 4 printed and nicely trimmed hard copies) cost €6. Maybe they've increased their prices for both, I did think a fiver was incredibly good value and told them so... so I guess I might be responsible for the increase! That one passed the tests they do on upload but failed at some later stage. The one from Photo Me failed at the start i.e. at the upload stage. You don't have to be too particular about head and shoulders, the high fangled uploading process crops it perfectly for you.
Oh, I did take my glasses off for the one the younger young lad took, having left them on for the two "professional" ones that were rejected.