Hi, I had the same problem, My photo uploaded without any error messages but for my dependent it was showing like this few times. I tried go to a different photographer, edited the photo multiple times and was showing "too bright or too dark" message all the time.Received my portal login details too. However, getting error of too bright/ too dark on my digital pic. Any idea how to resolve this anyone?
Then the UPS store photographer said this happens with them all the time with the PR card photo. They have lots of candidates took photo from there and IRCC portal showed this message and still they managed to get the PR card.
So we got convinced and uploaded the photo. Its still under review. I haven't had any updates after that.