This works, but you really don't need to pre-zoom your work on PJ, since there are zoom buttons under the image. You should just upload the 1x version (ideally with a transparent background unless you have a purpose for the solid background), and let viewers choose the zoom level.
Instead of submitting it separately, you should make the avatar be the preview image for the full version. That way, you avoid redundant artwork in the gallery, and still get your avatar.
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This works, but you really don't need to pre-zoom your work on PJ, since there are zoom buttons under the image. You should just upload the 1x version (ideally with a transparent background unless you have a purpose for the solid background), and let viewers choose the zoom level.