If you are looking today you are noticed that every country currency are continuously goes down but the USA currency dollar doesn't seem slow.
Its continuously growing faster and faster, which means if you are working here and earned money it will become more valuable then any of the currency across the world.
You photo must be in colorful and the second most important thing is the background.
Means whenever you click your photos then one thing is noticed. Always use white background, otherwise your application will be rejected.