The room is very nice, but here area couple of suggestions:

One of the two chairs should go, and the remaining one go in the window corner.

Pull the end tables out from the wall and position them against the arms of the sectional. No one could reach to put a glass on the tables.

Big thing, you could do so much better with the window treatment. I would extend the rod as far as you can on either side an add fuller draperies...at least 1.5 panels per side. Choose a pattern.

Pillows are okay, but you could also do a couple in the drapery fabric.

I like the animal print chair - at least it appears to be an animal print on my screen.

Grey and brown can work very well together.

imo, the throw pillows on the sofa are the issue. So my approach would be to just change those out. I would bring in a couple of faux leather pillows in camel/cognac; and I would not use much more than those two pillows on the sofa.

I like your room! The couch is just fine.

Since the couch is so long and you have so much wall space, could you hang some art on either side of the one you have now? Or do a gallery wall? Perhaps a hanging plant?

I think something like this would look nice: https://ca.shein.com/Marble-Pattern-Cushion-Cover-Without-Filler-p-2916417-cat-1945.html?url_from=caadplashpillow242106164744545&cid=9680463591&setid=102385692874&adid=426739929306&pf=GOOGLE&gclid=Cj0KCQjw_viWBhD8ARIsAH1mCd6FSSK5zhMsq3RXDsExo0HbBBDQhc9XqkE9UU4qnM6o88UOrcx2jgIaAmNtEALw_wcB

or this: https://i.etsystatic.com/6262999/r/il/11c0aa/1501936645/il_570xN.1501936645_81bg.jpg

Agree that you only need 1 chair in there. Could put a low ottoman where the chair in the entryway is