I could see your lumbar pillows on your chairs but in a coral or burnt orange silk fabric. You could get a cover made.
For a floor lamp, I'd be considering something vintage, I think. Art Deco or French MCM. Or maybe something whimsical. Something sculptural but not too visually heavy for one of your corners. I browsed Chairish, 1stDibs, One King's Lane and Anthro and there's all sorts of price points out there so this is just to give you ideas. (Didn't check sizes.) You have a great eye and probably more leeway than you think when it comes to furnishing your space. Trust yourself. Btw, I don't think your metals in the room need to match.
This one might be too "delicate" but it's reminiscent of those Serge Mouille lamps.
A flamingo lamp! :D The shade is too casual for your space but it's the right shape and could always be replaced. This one comes with sticker shock though. :P
Q
Artwork inspo
Q