Yo're making what I see as a far too common mistake here. You're (correctly) keeping your attention on the primary subject and making sure that it's in the image etc, but you're (incorrectly) failing to scan the whole viewfinder yo make sure that you're getting all of the details before making your exposure.
Let's look at these images more closely to see what I mean ...
#1 ... the bouquet is clipped on the LH edge of the image. The image is basically a little too tight; brides spend a lot of $$$$ on their bouquets; it needs to be fully included. I'd like to see more work done on the B&W conversion too - whwere's the detail in the bride's dress, and particularly in the veil? It seems blown, and that may well be the case.
#2 the bouqut's edge has again been chopped. And there's little shadow detail here: should there be a little more texture evident in the dark tablecloth?
#4 "Does my bum look big in this?"
Seriously, where is the rest of the bridesmaid? Again, she's been chopped. And again, the bride's dress looks blown.
With three images showing these "exposure" issues, but all of these images having undergone conversions from colour to mono, I'm not sure if what I'm seeing is exposure related or a conversion issue. My inclination is towards this being an exposure issue, because a bride's dress is difficult to expose for in the first instance, and the conversion seems to me to be actually wanting a bit more contrast, which I suspect will only make the bride's dress look even more blown.
Just my thoughts.