Why can't you put a heavy (2 or 3 inch diameter) wood curtain rod right across the bay window and let the panels frame the bay? Take down the two prints to the left of the bay and you have plenty of room for full, lovely curtain panels on wooden rings. Select a wonderful curtain fabric and redo the seat upholstery on a companion fabric or a solid. Your dining room has a lot of elements that, taken separately, are all great, but they are not consistent in terms of quality or style. I personally like the chandelier--- it dresses up your dining furniture in exactly the way French country is supposed to look. But the fabric upholstery doesn't add anything. IMO the two elements that are way off are the unframed canvas---not nice enough for the room, and the mirror, which looks sort of "olde worlde Tuscan". Putting a bench in that window will block a lot of the light, and will not provide any really useful seating. Who would eat there at a tv tray or small table or with a plate in their lap when the others are seated at the table? So, I would replace the mirror with something bigger and square or rectangular and gold leaf and fancy. Put beautiful curtains on the bay on a gorgeous gold painted or gold leaf fluted rod held up with brackets. Reupholster the chairs in a beautiful solid color. Take the two framed prints and put them where the canvas is now (and move the canvas to another room entirely).

Change the swing of the powder room door, so that the person in the kitchen never has a view of the toilet. Do you have a peninsula with chairs in your kitchen? Your current traffic paths through your house are causing you problems. Here's how they look now. People crossing the middle of the family room/living room to pass through. The pathway from the door through the dining room effectively reduces its size too. I'd close that door off to help traffic through the dining room. Optionally, I'd also open the space by the basement steps to the living room, and move the doorway between the living and dining rooms.

Need room measurements, and # of people you wish to seat. Are you planning on having just the table and bar cart, or do you want a buffet, China cabinet, or other storage pieces in the room? You need plenty of space around the table so people can walk behind a chair that someone is sitting in.

hanging a light from the 16ft is an option its just how much do you want to sink into it. otherwise you could go back with track and run it width wise and just add track heads. you could also go back and add wafer style LED "recessed" lights. you could also hang the track on the green wall above the table and face the lights down.