What part of Canada? What types of plants are you thinking of, what kinds of features being offered by them?

I live in Ontario. I’m thinking of low maintenance greenery vs overcrowding the garden with lots of colourful flowers. Although I like the idea of having different shades of green and a pop of colour. I’m thinking something with symmetry.

I’m thinking something with symmetry

Probably because that part of the house exterior is geometrically symmetric. However if you use a formal planting arrangement that will not relate to the rest of the house front, which it can just be seen in your picture is not uniform.

It sounds like you would do well to simply add some more dwarf conifers, fill in the rest of the bed. Choosing an assortment to get your desired variation in green. And noting representative later sizes so that you don't have something get bigger than expected during your time on the property.

I think your best bet is to find a groundcover in the 6" to 8" range that will tolerate the light conditions there. Plants growing in front of the windows, covering them, do not look good.