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some of those sites are now also on https.

go through a few of those linked images to get an idea of which sites are linked to the most.

then check if those sites are using https and test a few of their images with their https.

now you have an idea of a large group of urls that you can pass a sql query to, converting them from:
http://example.com/image.jpg
to
https://example.com/image.jpg

for the rest of the sites, and other random ones, you can either keep them as they are or risk doing a batch conversion again. this is one dellema which many long running websites need to deal with.