I would add a few more things maybe some smaller notes coming out of the piano, and maybe a base clif. Not a lot just a few, quilt with a light weight thread matching the background. Don’t forget to Sid too and just do a stipple in the background. Also if this makes sense just quilt a 1/2” interior border 4 to6” in from the outer edges to give your stipple a boundary then do a piano key outer border to finish. This should give texture without overpowering the real effects. Good luck