I would be complementing your beautiful art, both color and style wise and room will benefit as well. Don’t suggest more than 2 on couch so people can sit comfortably and when more interesting especially, less is more (and be sure they also connect with each other).

https://www.yayaandco.com/collections/echo-abstract-collection?pp=1&epik=dj0yJnU9QU91VUxua29qZjVkRXFNMWZCYTc5dFRNX3o4NVlzby0mcD0wJm49N0EzZWI3dU9hSllJQ3dJWVlneE1FZyZ0PUFBQUFBR1B2bExV

On another note if interested, accessories warm up a space.

I’d bring in black, lumbar style, and not too matchy that would compete with your art.

Etsy pillows

Or just stick with a solid, neutral color (with texture). I prefer patterned for a more layered look, but that’s personal preference.

Too many pillows IMO if you have to move pillows to sit down you have too many . I like bolsters on chairs and I think 2 pillows on a sofa are all you need. If you want some color a throw is IMO less obtrusive. You have this great art choose colors from it .

I presume you are wanting pillows to bring color and texture into your space and not because they are needed for comfort. In fact, those pillows look utterly uncomfortable placed on those chairs. Your furniture is nearly overstuffed and pillows are not needed and leave little room for a tush on the chair or sofas. Consider a throw on the sofa instead. If you want to bring some texture or warmth to the chair side of the room, maybe a different lamp with some texture to it that doesn't look so hard.

Beautiful wall and trim color by the way.

That end table between the two chairs really needs to be round. All the corners are fighting one another.

If I just do two pillows on the sofa should they be the same or different pattern/shape? Thank you!