Maybe attach some megapixel of a picture check before you can post, or look to the metadata of a picture and this must be filled and not older then 1 year for example...
This requires a massive change on steemit I guess. I am not a developer.. maybe this can be build by steepshot..
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If you used a tag system based on machine tags like #photo:date=01-24-2018, #photo:megapixel=13, #photo:geolat=12.3456, #photo:geolong=-98.7654, #photo:cat=sunset, etc. his could be useful.