you'll find the answer to your question by reading the forum for member experiences, making notes, reviewing other sites and pictures and comparing against what you received. Anyone here can provide you pointers but it's you who reviews and accepts the pictures.
You might get 100 answers on what to look for and based on those you accept the pictures but what if someone posted after you with #101 and that happens to be the one item on your watch?
You need to keep all things in perspective and remember you're buying a replica item at a fraction of the genuine.