Numerous rendering errors throughout in this example and probably the others as well, when viewed at 100%. Also, ditch the 1:1 aspect ratio. From a buyer's point of view, I would want some room to crop or add text as needed. There is really no use for square designs. If you want to submit similar images for use as backgrounds for desktops or phones or whatever, a 9:16 or 16:9 ar is more suitable.

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