This selfie was compiled from many smaller images -- which is why the mechanical arm holding the camera is not visible.
In case you're not impressed, notice this comment on Reddit by djellison who is Engineering Camera Payload Uplink Lead on Curiosity and Opportunity.
This spacecraft - Opportunity - in a REALLY GOOD day - gets a total downlink to Earth of around 80 Megabits.
That's 10 Megabytes.
Read the rest of his comment.