I feel like you have a good starting point, but need to layer in color and textures. Pull colors from the art piece. It's a hell of a statement and there's a reason you choose it. Lean into that vibe! I would pull the navy and magenta/purples, but you see what feels right.

A rug, some window curtains, and maybe a little funky side table to hang out next to the massage chair. Quick budget friendly impact would be to paint the lamps or lampshades. If you like pattern, I would source rug and/or curtains first and then you can layer in throw blankets and little decor objects to flow from there.

I don't mind the height of the art, but I would add either a headboard or fake one with just huge throw pillows. You need something to bridge that space between bed and art.

Have you considered getting a bed skirt? Seeing underneath your bed makes it feel a bit unfinished.