I think I would consider a third plant in your clutch of evergreens if you have space. If the three plants together create a triangle shape this will complete your scheme
Exactly I am planning to add another to the clutch; a shrub or sorts, not sure which I saw this in someone’s garden which is very interesting dark and shiny- maybe too dark-or I think a shrub that’s grow high up- waist high...
Your photos is a Hebe @fareenaism. There are hundreds of varieties, different colours and sizes. Readily available in GCs and nurseries etc Re your conifers - there's literally countless varieties of them too. Many are naturally columnar, or conical in habit. The Chamaecyparis pisiferas are a nice shape, and have a softer, often bluey, foliage. There are green and cream varieties of those too.
Hebes grow well in a soil that is well drained and has full sun, they also vary a lot in size. Perhaps you could take a small piece of your Pieris with you when you purchase your conifer to see if you like the colours together. As the season progresses the Pieris colour won't be so bright. Hebes also flower so check what colour the flowers will be too so you are happy. The further south you live the better a Hebe will be and they are very happy by the sea.
I have worked as a Gardener for 24 years. My latest garden is a new build garden on heavy clay.
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Re your conifers - there's literally countless varieties of them too. Many are naturally columnar, or conical in habit. The Chamaecyparis pisiferas are a nice shape, and have a softer, often bluey, foliage. There are green and cream varieties of those too.
Take a look here for some ideas too
https://www.scotplantsdirect.co.uk/plants/garden/conifers
I live in west central Scotland - not where that photo is...