Cute room! I like what you have now. You could really go with plain or patterned, but I like the visual interest of the current curtains. The design seems like the right scale.

Nice room. If it were me, I’d go with plain.

Personally I do not care for grommet top curtains, so I would replace what you have with a lightweight off-white linen. I'd hang them from iron rods and rings, and mount the rod a few inches higher and wider than what you have now. Use 2 panels per window so you can leave them open during the day. I'd also add a textured bamboo shade for interest.

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Ditto what Diana said. Do you leave them closed as in the picture? You need to use double width panels 2 per window.

odd man out...have you considered a print curtain? I like the plaid on your table runner. I think that would make a nice window treatment. I would hang them as stated above. In your living room I would go with a heavier solid white fabric also as stated by Diane. Very cute dining space.

Another option would be to use both. To do this, you would need to change your curtain rods to double curtain rods. The outer curtain rod would have solid curtain panels, and the inner curtain rod would hold the patterned panels. Of course, the colors should coordinate.With this look, the solid colored panels 'frame' the patterned panels. It's a sophisticated look that adds simple elegance to your windows.

I like the suggestion by whatashoper1, but I'd use the patterned curtains on the outer rod and sheer curtains on the inner.

Doubling ready made drapery panels was a popular way to get a more custom look in the beginning of the last decade that can still be done with success. It essentially was the chameleon for a custom window treatment that used a contrasting band on the inside lead. Here are some photos I quickly grabbed of what that looks like.

These have been done on a single rod

these have been done on a double rod

single rod

single rod

I love those drapery window treatments. What are the sizes of your windows? I think they might be too small to accommodate that much fabric.