I am no expert but what kept throwing me off was my eye keep focusing on the pot and not the plants. I do not know what to tell you.
I am thinking they need something to pull them together. Can you get some plants to put in all the pots that spill down.
All the instructions of successful pots are a "Filler, Thriller, Spiller. If all the pots had the same spiller it would pull them all together. I plant petunias in all my pots as the spiller and some are very fragrant which would be a plus by your front door.
or.....
Buy a bunch of small pots and fill them with the petunias. It just looks sparse and not lush.
This is what I am thinking.
https://images.search.yahoo.co...
