Nice and sharp
I'm guessing you were at 6.3 because you couldn't go any lower, but if you ever get a chance to use a different lens, try to drop your f-stop as low as possible to blur out the background. The photographers in the background are a little distracting, as is the line through his head. I don't know what the original crop looked like but I might have tried a horizontal crop with negative space to the right for him to move into.