It seems like a standard squarish room. Many dining tables are rectangular in their smallest configuration. As long as you usually use the table in the size of your photo, I personally wouldn't go with a rectangular light - especially if it required extra mounting points. Stick with a traditional circular/globe/roundish chandelier. Gives you more options down the line without having to patch holes in the ceiling. Discalimer on next comment: I've never refinished a chandelier with spray paint. I think there is enough detail on your chandelier that refinishing could easily look sloppy if you're not very careful during the process. Don't forget to get a new chain if you do refinish (assuming you're not going to go through trouble of spraying all sides of that). Anyhow, I would suggest a new chandelier if the budget allows. I like your choice. Assuming you stick with open chandelier and candelabra style bulbs, add some nice flame (bent) tip, frosted, 2700 K, ~300-400 lumen, dimmable LED bulbs while you're at it. Something like this: https://www.satco.com/s9869.html They aren't cheap, so budget for that if you have a lot of bulbs and decide to go with LED. Also, you may need to upgrade your dimmer for LED. Good luck!

If you like red, there are gentler, browner reds / rusts/ spice colors that would blend better with the wood and floor. Another red over red wouldnt be that hard to do. As far as window goes (is there just the one?) a woven woodsy type of shade to relate to the wood elements or curtains with simple pat]tern incorporating reds/browns/whites.

Once you have furniture in your space the chair rail will not be noticed on that side. It will not be the focal point. Your furnishings and artwork will be what people will see. Also, spaces that are completely balanced are not nearly as interesting as having a little asymmetry here and there imo.

That table is far too large for the room, sorry - I know you just bought it. Your room would lend itself better to a 54" to 60" round table. Suggest you put that table back on Facebook Marketplace and go that direction. Over-crowded dining rooms never look good.