Really good monochrome outfit Sir.
Only positive suggestions..
Excellent collar fit, looks snug without being uncomfortable, good collar height and stance, good tie knot (personal opinion - add a second turn to make it a DFIH to add interesting visual detail).
SC fits well, nice high gorge I like the high sleeve openings as well.
Pocket square is good but again - personal opinion - add more fold or turn it edges and corners up to add interesting visual detail (see example pics below, with respect, I am sure the owners of these pics will not object)
Maybe a shiny or brushed steel tie bar/clip, nothing like the glint of steel to catch the eye. (more detail)
Whoa that made my brain flip, did you get a gun club/gingham jacket made the same pattern as your shirt?