SketchUP & Lumion landscaping project tweaks

I've got a partially designed landscaping project, as previous designer is unable to continue due to personal reasons.

There's a SketchUp file which is not quite up to date and a Lumion file used for rendering.
Would like to move some things around, maybe add further landscaping insights and ideas.

For now I would like to finish the rear garden with elevation and planters/retaining walls so we know how to do the digging, once that's completed we can work on the front driveway.