Yep of course Peter. You can never ID from a photo to give absolute certainty. I am just starting with my microscope again and I am finding that it is often hard enough with that!
A photo can give a quick most likely though but can not in most cases be used by you on the recording scheme.
As for getting things wrong. I jump too quickly to conclusions a lot only to find I am wrong upon close examination. However there is often a certain something about a species which if you know it very well help with fast ID even if it will have to be confirmed using a mic.