I agree with above, go with shelving that spans the full width (but not necessarily full height if you don't need that much storage - anything you put up will probably affect the usefulness of the ceiling light you have in the nook). Plain white shelves like this would go fine with the other shelf you have

Given the bulkhead over the stove impacts on the symmetry with the window now, I would put the shelves over the microwave and maybe extend the pantry cupboard to it’s left up to ceiling if you need more storage. This will balance the symmetry, then you could add a shelf either side of window for more decorative effect rather than storage.

Avoid the niche and have a full length shelf. You can also use tile trim or “angle” in a metal to match your fittings. Or depending on your other tiles a capping or pencil tile can be used to neaten edges. Niches can be problematic.

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