Agree. You have a lot of pots that are the same size. And a lot of plants that are the same size. You need some variety of size in both height and size of the pots and plants. Colors appear to have some variety and texture from what I can tell which is good so mix that up in pleasing combos. The eye needs some visual relief from the plants so leave some blank spaces around the terrace too.

I like the symmetry of the pots against the building and I would leave that as is.. I group my pots generally in odd numbers and stagger the pot sizes in the grouping, and also mix up the pot shapes in a grouping. My pots look similar, but I pair round with square, etc. I anchor my groupings with a large pot, and I find large pots easier to keep watered. If this were my terrace I would plant some trailing plants along the edge in some pots for a more lush look. I would add a few more pots with some colorful annuals. As czarina suggested, I stack some of my planters. Some of them are stacked on upside down pots. Here we have plant stands for hanging plants - you might like that look with lush trailing annuals. You have a lovely terrace and the plants you have are a nice foundation. My biggest problem with a large pot garden is keeping it looking nice over the winter. I mulch my pots nicely and plant violas and pansies as much as I can for winter. I don't know if you will have that problem in your zone or not.

Also, I forgot to add that I plant for fragrance as well as appearance. I don't know if that appeals to you or not or if you've thought of that. I tuck in mint, lemon balm and basil, or have a small pot of just one herb. Rosemary is nice. I also plant my flowers with nighttime in mind. I always have some white around my patio because it shows up better in the evening. I love purples and reds but they don't show up as well at night. Fragrant plants are particularly appealing at night.

I think the rectangular boxes under the windows are fine, but agree that the others should be in clusters and different heights starting in the corners. What a pretty terrace.

I think you need to vary the size and scale of the planters & the plants they house. The larger planters can anchor your outdoor garden. Height can be changed by placing a few of the planters on plant stands.

Looks like you have bamboo started in the wood planters. Those planters will never be large enough to hold the bamboo as it grows. A tree would be a nice addition to the terrace. Just make sure the structure can handle the weight of the planters, soil, plants and water. It all gets very heavy.

Thank you all for the wonderful advice!! I'll do layers of different heights, and place the pots in groups starting from the corners.

I also loved the idea of trailers on the ledges, and fragrant plants! :)

Beverly, you have the best pictures!!

Sofif713, I'll second the idea of grouping the pots instead of single-filing them. When my outspoken 82 year old mother sees anything arranged like that she usually remarks that they are lined up like a firing squad :-)

I wouldn't put any pots on the ledges of the terrace for fear they might topple over and hit someone on the head. I would put trailing plants inside existing pots along the edges of the pot.