It is very rare (so rare that I have only seen it happen 1 time in more than 25 years) that an honest seller will post dark, distant, fuzzy, shadowy or otherwise hard-to-see pics of a genuine watch for sale. On the other hand, it is common for rogues to do these things in an effort to obfuscate the details of their crime. Excuses like 'I just got this camera' or 'my wife/friend/dog/fish took the pics' or 'the best I can do with this old camera/phone' are all lies, or should be taken as lies.
1 other thing - Never, ever purchase a Rolex watch without seeing good, clear pics of the movement. And if you are unsure what a gen Rolex movment looks like, ask someone who does know. That way, at the very least, if you end up with a franken, you end up with something of value you can resell to recoup some of your money back.