what about a floor lamp and a nice textured pillow to pull out the yellow from the lemon print?

I very much agree with yellow pillow, plus a sizeable plant to one or other side of the chair -- we would need a pic that shows that corner in its context in the room to say more, I think.

I do love your William Morris poster.

You might try a lamp, a large plant, a side table, and perhaps a pillow and blanket. It might look something like one of these designs of ours:

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