I'm not usually one for post processed blurring, but the couple of bolts that are in focus are a bit distracting. I might suggest subtly adding some blur to those.
Also might suggest framing slightly different - maybe crop the left edge of the image in a little bit (to elminiate the left-most bolt that is just barely in the picture, and maybe experiment, I don't think it'll look good, but maybe, with bringing the edge of the photo right to his left ear) and maybe bring the bottom of the photo upwards.
Maybe completely irrelevant is a sliver of rim that catches the golden hour sunlight - you might try to de-emphasize that.
You might try taking some blue out of his overalls, which may help his eye's pop out of the picture a little more.
Great position and smile!!!