Drapes and curtains for arched windows are designed to create a softer look and highlight the architecture of the foyer. The top valance drapes around the arch. Metal, wrought iron, handmade medallion works with the foyer chandelier creating unity.
Replace your curtain rods with swing arm rods to open up the room and allow more light in. Windows appear to be bigger than they are, too. Love swing arm curtain rods, I have been on the hunt for old ones for a long time.