Look at the lighting. The subject is in shadow and behind him there is a large patch of sunlight. Better to eliminate the sunlight.
You are shooting at too low ISO. For an image like this you need a shutter speed of 1/200s to avoid camera shake (unless you have a VR lens) and you're at 1/50s. I leave my D300 at 400ISO most of the time and even 800ISO
Charles
Nikon D800, D7200, Sony RX100m3
Not buying any more gear this year. I hope
