Circular retaining brick edging on a slope

[diyjunky]

I want to create brick circular edging to fill a small area with soil for planting out. Please see the photo.
I am trying to figure out if just using one tier of bricks that follow the slope of the ground would look OK ? My initial thought was that the bricks should be brought level giving a kind of low level flower 'box' My wife thinks that the single tier would work but I am slightly doubtful with the drop in height.
Can anybody give me some ideas or thoughts on this please ?
Thank you.

 

[Why Not Indeed]

You may or may not be bothered by this but I think it might look odd if it didn't "echo" what that wall behind it does, ie sloping from 1 - 3 bricks.
If your plan is simply to lay a single course of bricks and fill just to that depth with soil then you risk something that dries out and needs regular watering. You should probably be digging down. Is that concrete under the gravel?

 

[diyjunky]

It's a 'canvas' membrane over the soil to stop weeds (it's been there for 3 years since we bought the refurbed house).
We would just top up the soil that's underneath

What you are implying is that; if the new bricks weren't visually inline with the bricks of the wall, it might look odd - it's an interesting point.

Thanks

 

[Why Not Indeed]

It's a matter of taste. Perhaps nobody would notice. Perhaps you wouldn't have noticed if I hadn't mentioned it! If the wall was rendered, it wouldn't be noticeable.
You could avoid the question entirely by just edging it in brick rather than having a small wall.

 

[diyjunky]

Great idea, l’ll render the wall !