Can you post a photo of the sconces?

Sure, this or very similar:

Savoy House Dakota 1-Light Adjustable Sconce, Warm Brass · More Info

No upper cabinets, just the windows flanked by sconces, with range hood in the middle

I think two good sized clear pendants or lanterns would not block off the view of the sconces. Depending upon layout, recessed lighting is also a good choice.

Thanks @simstress and @Brickwood. I like the clear glass pendants, maybe globes. Would 10" diameter be good?

I would do only 2 on an island that size. I think you could go up to 12"-14" with no problem.