Passport photos consistently rejected due to unclear official requirements and subjective enforcement

People spend time and money getting passport photos taken, only to have them rejected at submission for vague reasons like 'lighting,' 'expression,' or 'background' that differ by country and official. They must retake photos multiple times, causing delays in travel plans and wasting money on repeated photo sessions. Current solutions (guidelines, online checkers) are either too generic or unreliable at predicting actual acceptance.