with the internal window, I'd put the sink on the wall so that as you do the washing up, you can look though the internal window & see what is going on. So you'd have a big L-shape of units around the side & internal wall of the kitchen with all the appliances etc.
Then instead of an island, I'd have a big decorative dresser against the wall opposite the units, so you can keep clutter (phone chargers etc) and store plates / serving dishes etc.