As a landscape architect I would be slightly cautious of AI solutions so make sure you double check them. For example mark out the design for real in your garden using pots/bits of wood/stakes to be sure dimensions are realistic. Think about tiny pointy plants beds which are often unmanageable, and make sure you are clear that nothing obstructs your desire lines.
For the planting look at plant heights in 5 and 10 years to be sure not planting monsters. Many quick growing okants just keep on going!
In fact, what about an enormous set of tv screens, so the backdrop can change with mood?
My Dad put up a swiss mountain scene on a lounge wall back in the 60’s 
I edited and lost my last comment.
Maybe it was your dad?
Yes, that’s a very good point - in fact ChatGPT’s pictures showed what the garden would look like in a few year’s time.
I’m also expecting the payagist to be able to answer these questions.
We were in London before coming here and our garden was very small so we know very little about gardening, but are learning.
My opinion of the botanical knowledge of French paysagistes is not very high. Check all the species suggested for yourself in terms of soil, aspect, eventual hight etc.
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