I would maybe pop the breeching up a hole and open his blinkers up a bit, looks like they could be actually touching his eyes/eyelashes which could well bug the hell out of him
Are the winker stays on the last hole in the middle of the head. Make them a hole or two longer if you can .
agree with Gimp, you need to shorten the back strap and have the crupper on the middle hole, never have harness on the last hole, if it breaks you have no holes left to get you home in an emergency.