Focal points in the landscape must be level. Most will shift in a year's time. I bought a pen sized level and straighten brick edging, benches, plinths, urns, & statues each year.
At Susanne Hudson's, above, last week. LOL, her landscape is GORGEOUS, and real. Soon her plinth & urn will be level again.
Are your focal points level?
Garden & Be Well, XO Tara