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LordzBacon said:"Knowingly or repeatedly uploading a lower-resolution image, if there is a higher-resolution of that image available" seems unfinished, If there is a higher reso of that image....What do we do? Since you can't repost something that was deleted, how do you post a higher reso of that image.
If an image was deleted, chances are it's irrelevant to the site or poor quality. In the latter case, take a look at the source of it (If one wasn't linked then don't even worry about it) and see what the quality looks like. If the source's top resolution looks to be a good quality and it simply offered up a thumbnail, then try uploading the full version.