I know in general, you make the post of an already existing post with higher resolution the parent unless it's upscaled, but what about if the post is the full version, not cropped, but is in much lower resolution? such as https://cdn.donmai.us/original/d6/c8/d6c8d3b67c6555f5ccf712a25b8505ac.jpg from https://www.pixiv.net/en/artworks/99121673 which is 826x908 pixels to post #8736869 which is 2048x1697 pixels but does not display the full image.
