Also, avoid white clothes-you don’t want to blend with the background, after all! You should look as natural as possible in your passport photo. Here are some tips that will help you prepare perfect passport pictures: While the US Department of State’s clothing guidelines are quite relaxed, there are some aspects you must pay attention to when choosing clothes and accessories for your passport photo. But what about the passport photo dress code? Does it even exist? Straight poses and neutral facial expressions are one thing.