I'm thinking two ledges, the same width. But, it really is based upon your art. Are you adding large vertical pieces? Small horizontal? Do you already have the art you want to add? I think get together your art to decide how you want the shelves.

This style was my first thought...Two equal size shelves centered between the windows...

A colourful London home · More Info

Same - I immediately thought 2 shelves, centered.

Thanks for the comments. I was going to add "2 shelves, centered" as a 3rd option. And yes, I'm planning on large prices like those shown in the photos above @darzy. I already have some of the art, still looking for a few more pieces. So thanks for that idea too. I think having it all together will help me decide for sure.

Here are some images I was looking at for 1 vs. 2 ledges.

2 ledges, off center:

2 ledges, centered:

And here is 1 extra long ledge: