What would you do with this?

I moved here two months ago.
The front garden is easy to deal with as it’s smaller and south facing.
The back garden (pictured) is north facing but gets sun almost all day at the back and the west facing side is sunny until about 8pm.
It’s basically a blank canvas covered in gravel (I personally hate the stuff).
The only thing I have planned is a picket fence around the bottom of the hedge (as a dog proofing measure; both sides) with a few gaps for the many hedgehogs I have visiting each night.
To the left of where I stood to take the pic is a small patio and my new shed.
I’m thinking an arbour in the back right corner and maybe a small greenhouse and perhaps a pond in the back left corner.
I’m on clay.
Any thoughts? Ideas?
J. 

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If you're keen to attract wildlife, including hogs, a pond would be a good starting point. Locate the greenhouse in the sunniest site. You can always screen that off, and any work areas too, quite easily with trellis and climbers.
All sorts of planting will work though, so make a list of shrubs and perennials you like, and those you don't like, and be realistic about the amount of room you have if you're adding an arbour as well. It helps to make some rough sketches - to scale.
Bear in mind other uses for the space too, like washing lines, compost bins, storage etc.
I live in west central Scotland - not where that photo is...
BROWN IS A COLOUR Piet Oudolf
It slopes very gently south to north and west to east
Natural/cottage. Formal makes me feel like I can't breathe
That was one of my thoughts. There is a concrete base under that bark on the back right where a greenhouse stood (previous to last owners). I did think about perhaps adding another deck and seating and perhaps raised borders around the sides not touching the hedge/picket fence.