Hi! Yes, such mistakes are common. I used https://digital-passport-photo.com and they explain in detail what is a digital passport photo and what State Department requirements need to be met. Common mistakes: file > 240 KB (solved by compression), background with shadows (further from the wall or raise the light), head less than 50% of the frame (re-cut closer). I took several photos, chose the best one, checked the file size and the head, cropped it to a 600 × 600 square and uploaded – passed immediately. Advice: strictly follow the site’s instructions and check the photo before uploading, then the probability of rejection is almost zero.