I deal with these often enough that I can attest to the general badness of takedown notices -- usually, they include the victim's name, the accusation that I'm infringing, and the demand for a takedown. Most noticeably, what is almost always missing are descriptions of the images, links to where they're located on the site (I can't find an image by name if one of my members posted it -- I just can't), etc.
As these include all of the above, I have to say kudos.
Somewhat offtopic, perhaps I should post my "Here's why I'm not complying with your DMCA takedown notice" standard letters as a response. (Not because I'm a dick, but because I don't personally violate image copyrights, and if my members do, it's hosted externally by design -- what I do instead is redirect the complainant to where the image is hosted and offer any assistance I can, short of editing user posts on my properties.)