Good luck
Usain Bolt was a superstar at the time when he broke records at the Olympics for multiple running competitions. He was labeled the fastest man alive and nobody could even come close to catching him. In this picture, he just shows how much faster he was than everyone else who ran alongside him.
He even took a moment to take his eye off the finish line and at his competitors and cameramen, to let them know he had this race under control. That is the face of a man who is very confident in himself and knows that nobody can come close to outrunning him.