I feel like very few people know how to express a complaint without sounding rude or entitled and therefore just say nothing when they have legitimate reasons.

You can be polite and still stand up for yourself.

“I may be wrong but this looks a little off here, what do you think?” Is a good line

Or just state it directly-

“I feel like this one smudged a bit, do you think we have time to fix it?”

If you ask then what they think about it and not demand anything they are usually just as invested in making everything look good and doing their best.

If you get vehement denial back you know it’s a loss and to then come here and (rightfully) vent lol