These are great shots of a window and art, but how can we help if we dont even see the table, let alone the full scope of the room. we need room shots.

depending on the height of the window sill you could do a custom bench following the sill but without clear pictures or size, it it hard to help

two things that stand out for an update.

1. the light fixture looks to be from 80/90's updating that would be a huge change

2. the rug seems a little too small.

If you wanted to add panels to the sides of the window to dress them up that would be nice, but the window itself has a nice view and doesn't really need much.