The differences are easier to spot if you've held a genuine; especially easy if you've had the opportunity to hold a genuine next to a rep! Pics can be deceiving at times, as photo quality, lighting, angles etc. all play a crucial role in perception. However, if you look at this stuff long enough, you'll develop an eye for it, and it will become much easier to spot a typical replica (or a genuine)! Modified reps, however, can be a different story