You should never include your face when sexting. This is a dangerous business—just ask every victim of the Fappening. Anonymity is paramount. One way to combat the hackers from lifting a photo of your genitals from the Cloud and posting it on some D-level porn site is to make sure said photo doesn't include your face looking all ra-ta-ta.
If, like Bryan Silva, you have a particularly memorable or terrible tattoo, it's also a good idea to not sext a photo that features this tattoo prominently. First of all, it's ugly; and second of all, it's another way to have your anonymity blown to bits.