Thank you

Perhaps a lovely live majesty palm plant to add some texture?

Move the armchair further out to allow for some floor decor such as vases or plants as the others have suggested.

Can you change the angle of the piano?

That’s a beautiful corner already — the piano and chair give it a strong focal point.

Some inspro

I'd mabe like to see a change in the window treatments. The ones you have are nicely tailored but maybe switch it up to something with some warmth to add to the room. There's not a lot of different textures in with which make it appear a little stark. Some greenery to add freshness would be good to. Otherwise I like the style of the room.

For a more modern style that you have I might go with a roller shade verses a Roman shade as shown here, but something along this line.

Your space looks fantastic. I would add an interesting lamp on top of the piano and pull the rug forward a little.