I think you need accent which will pick up the colors of that amazing painting !!!! I would also add more fabric textures into the pillows as well.

HI Katy! Hard to tell what colors are in your drapery and your wall color. Everything is beige and brown except for the pumpkin (?) colored chair. You need to draw your accent colors from elements in your room. Can you confirm the wall, chair, and drapery colors for me and I'll be able to help you to tie it all together. Thx!

Looks like a blank slate ! Is that lamp purple or gray? You just need color texture and pattern. Beautiful room! I see a two pillows on the wing backs in a pumpkin pattern with fringe . And on the sofa a mix of pattern and solids, some purple, some neutrals , something ethnic, maybe a hide . Maybe a throw on one wingback and the sofa? Really beautiful room, lots of seating is so inviting!

Chair is distressed chestnut leather from RH. Lamps are translucent blue. Drapes have an olive green in them.

Not sure whether to go yellow with pillows to pull out yellow in painting. Want more texture.

Shape for pillows? Lumbar or square.

Walls are essentially an off white.

Velvet blue pillows and satin olive green for sofa. Lumbar pillow for soft chairs in a pattern in those two colors.

On table a medium sized handblown blue glass dish, candles, book on one of your interests. The deep blue of your painting.

Blues and greens for pillows to draw from the painting, and/or possibly pumpkin to pull in the chair. I wouldn't go with yellow.

Solid sage green (as in drapes) and solid blue (as in art) cushions for the sofa. A sage green throw on one of the chairs by window, with tone on tone orangey lumbar cushions (like RH chair color) on both window chairs. (See pic below for throw arrangement and tone on tone cushions Etsy).
For coffee table - a stack of three coffee table books for shelf and a nice glass art piece in similar color to lamps.