What about 2-3 truly wonderful pots - 2 smaller ones to the left of the door and one big one to the right- planted with a lime or yellow coleus, salmon impatiens, purple torenia, and a cascade of lysimachia nummularia don't know its common name)? After frost, you could remove the blackened plants and using the soil in the pots as anchor, "artfully" arrange some greens and some berried branches and string with some small Christmas tree lights. As for the area in front of the pots, I'd look around for plants that flower at different times but with great colorful foliage in at leats 3 seasons. Hostas now come in many beautiful colors and color combinations and a few have white flowers that smell like gardenia (usually in August here). Coral bells too, like the 'Lime Rickey' already mentioned, and 'Amber Waves' and 'Marmalade'can add season-long interest. Color from foliage has the advanatge of not having to be deadheaded and not attracting bees and their potential stings. Not very helpful flowerwise, but whatever you do have fun with it.

Scrolling through the photos my first thought was it would look nice to have a plant or flowers for some softness. The table is pretty ornate so I'd keep the top simple and less. The last photo is better balanced. I'd actually lower the flowers a few more inches in the vase.

I like the idea of leaving the floor space open as decoenthusiaste suggested. If you are looking for a quick easy solution try Ikea trones. They come in white or black and are an inexpensive solution. they also come in black, You could put a mirror above 1 or 2, They are for shoe storage but they can be used to store other items as well.

Narrow (12-15") console table on the wall across from the window with lamps and a plant on it along with a colorful painting hung above. A colorful rug between the door and the floor vent.