Both this issues are more about personal choice rather than any sort of orthodoxy, when the degree is small. For example, I think your suit already shows about 1/8" of linen, which is perfectly fine (more will show when in motion of course). Personally, I greatly prefer only a sliver of shirt cuff showing (1/4" at the very most) when standing normally rather than the the 1/4"-1/2" range more commonly seen on this forum. There are some vaguely plausible aesthetic reasons to choose to show more cuff with certain outfits e.g. if all the other details are in sync with it (e.g. relatively short jacket, minimal trouser break, etc, etc). but all else being equal, it really is more about personal choice. Turn-ups/cuffs follow the same logic, but even more so IMO.
Anyway, was 50/50 about this tie choice today, but in the end couldn't be bothered to change it after I got dressed and saw how it looked in the mirror... a dark brown or dark navy would have worked better than dark burgundy though.