- Scale: Your table appears to be approximately 36 to 42 inches in diameter. Your centerpiece should be approximately 12 to 16 inches in diameter for a table this size. That is for the "pot, urn, vase, etc." Whatever you have coming out of it can be much wider. (even as wide as the table itself- but not wider) I would have an arrangement with greenery coming out of it. This will draw the eye up to the grandeaur of the entry.
- Balance: Your table has a glass top, and a fairly light "visual weight" To avoid your table feeling "top heavy" do not have a centerpiece that is too "thick and dense." If you were to have a "heavier" looking table, you would want a thicker, denser arrangement. (like the one in the lower photo)
- Style: You describe your personal style as "earthy, rustic, casual." You also descibed your home as "fomal," which is clear to see from the photo. I would perhaps consider replacing the table. The glass, smooth lines, and cherry finish are definitely formal, and also I feel like your entry needs a heavier "visual weight" in the center. The picture that I posted is a table from K&K Interiors. It has a distressed finish, more visual weight, and is rustic, yet formal. If you opt to keep your table- your arrangement should be consistent in style with the table that it is sitting on, for example- the centerpiece in the upper photo.
Good luck Michelle! Let me know if you have any furthur questions, and be sure to send "after" photos!
Thanks to Decor magazine spring 20008 for the photo.