I've done a few ponds in my time.
There doesn't seem to be any foreseable problems as far as I can tell from the pic.The only thing I can recommend is that there is enough fill between the liner and the wall so that the grade and shape of the pond is functional.Sand makes the best fill.
In an aside you may wish to run a random pattern of fishing line across the top of the pond.If Egrets and the like spot your fish they will have a field day.
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