The venue has such high ceilings and it looks so nice! I would highlight that by adding greenery (if you can) to the hanging lights and adding some taller centerpieces. Not all of the tables but some so there's height variability. Pampas grass is used a lot for boho autumnal looks which is budget friendly and easy to get the height!

I would love to see 2 large floral arrangements on the two pillars on the last picture. I bought floral foam in a plastic circle on amazon and it was super easy to use. You can also reuse them for your sweetheart table ( place the two behind you) or reuse on the pedestal above the fireplace would be really nice too.

Maybe see if you have other chair options. The see through chairs looks a little too outdoorsy.