Yes, because if you used Photoshop, Fireworks, or another imaging program to flip the photo horizontally (turn it into a mirror image), you would go from a left shoulder to a right shoulder . . . but you would also cause the word 'Nana' to appear as a mirror image. It's spelled correctly in the close up - which should mean the photo showing Trayvon's face was the photo that was flipped. Is the writing on Trayvon's hat mirror imaged, or does it read correctly (I'm currently working off my phone's browser)?
The picture of the tattoo and Martin’s face (from Twitter) is taken from too far away to tell exactly what the word says. You can only tell that it is a word, and is sloped in thee same way (from high to low towards the chest).