Board Thread:Support Requests - Community Management/@comment-848088-20130816070922/@comment-154566-20130816124539

It's true, a copyright holder posting an image on a public website isn't the same as permission for anyone to copy and use. It could be a factor in determining whether each use is or isn't protected as fair use, though.

Since you're the uploader of some of the images, you might ask for a copy of that DMCA notice. DMCA notices are generated often enough by webcrawling scripts without human oversight, often enough by online pranksters, and often enough by people who grossly exaggerate their rights, that I wouldn't assume every claim in a DMCA notice is valid without checking each claim out, line by line.

You can find a wealth of information about the DMCA's takedown procedures at Chilling Effects' DMCA Safe Harbor FAQ.