I was thinking same as anj_p. Main sink and dw on the left wall, small prep sink on the island. Usually I see the island prep sink more to the side closest to the fridge, but if you need symmetry it can be centered.
Maybe something like the kitchen layout below. Yours of course would be a little different, but hopefully it gives you an idea.
Agree you don’t have the isle space for extra seating on either sides of island.
As mentioned, if you post the dimentions of walls, windows, isles isles, etc… you will get better feedback.
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Layout
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