Great start, love the art piece! You could even add more cabinetry/or a desk that will fill up the entire length of the wall and then add plants over top. Once the length of the wall is filled you could add floating shelves on either side of the painting for decor/more office storage. I would also add maybe a faux fur throw over the chair for some variety in texture. What flooring does the space have? An area rug could look great as well!

Or if you have enough room you could also rearrange the space and have a credenza against the wall under the painting and have a desk in front as seen in this photo:

Would love for you to follow us on Houzz if this helps at all! Looking forward to seeing updates of the space.