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No restrictions on the images. Says so on the other side of the links.

Hope you don't mind that I drop a note. Great stuff. I'd love to see it get the recognition it deserves.

A lot of the voting trails like to see the copyright status indicated under the picture. Sometimes I add it to the picture, like this
Synapse demo.jpg

It's hard to see because I made the picture so small here, but the credit is legible on the bottom of the picture. This way, everyone sees right up front where the credit resides. If it's a CC license, I link directly to that license. This seems to be the way curators like images to be credited.

Good luck on Steemit!