The pendants might be a little to busy in this room. Are you keeping the scones you have? also you could swag a fixture to center it looks like you would need at least a 24-inch long plate to cover and get you to center.

I would get some blue painters tape and mask out how long the mounting plate actually needs to be to sit centered to the table. be diligent to look up the size of the plate other wise it might be easier to swag it.

Thank you! Yes, I’ve been paying attention to plate size, and I’m not attached to the sconces on the wall at all. I actually found some similarly shaped to the pendants, kind of wine-glass-ish

I would also consider puting the larger art on the larger wall and the smaller pieces on smaller walls. I would not have anything between the two windows. This way you can extend the curtain rods to fool the eye with the room being off center ...

Thanks! Yes, the artwork is just kind of there from before when it was loosely a sitting/reading room - it wasn’t going to stay there.

When you swag a light like that, how do you guarantee the hook will hold?

It's something that has been done for a very long time, there are anchor hooks, hooks for weight, and sometimes you might even find a stud to screw into.

First, let's talk about installation if it is less than 200lbs.
The only time you should use "a plain screw-in hook", is if you are absolutely sure that you are going to hit solid wood. And then, you need to get at least 1-1/2" (I usually go for 2" - 2 1/2") of the screw into the wood. If your ceiling is 1/2" thick, then the screw needs to be (min) 2" long (1/2" + 1-1/2"+ however thick the canopy bracket is). The thickness of the canopy bracket must also be added to the length of the screws. You also need to hit the joist with at least two screws. This would be an easy and acceptable way of securing your canopy to the ceiling.
If you cannot hit a joist, then there are many anchors that will do the job. One that I recommend for this type of need is http://www.lowes.com/pd_115648-1.... It is rated at 265lbs for each one you use. They are very easy to install and it is minimally invasive on your ceiling.

https://www.tryeverythingblog.com/how-to-install-pendant-light/