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I was going to upload this photo [warning: half-naked woman] to Dreamstime and to other sites, but then I got warned that I needed a model release and ID photo for nudes, even if the model's face is not visible.

I understand this is only to avoid photos of minors, but now I'm not sure if I should upload it to other sites that don't have such restrictions... The girl in the photo is a professional acrobatic dancer and she has quite some fame (so I'm told)...

Maybe it is better to let this one go, right?

Well, I did have permission and was even encouraged to take the photo(s), but I see your point and have to agree so I'm not uploading to anywhere.

when I clicked and found her face missing very offensive for some reason.  Almost like stumbling across kiddie porn on the web.  If you don't have her permission for such a an intimate image, how could feel good about exploiting it?

Just to clear this, the photo was taken in a public event, seen (and photographed) by hundreds of people, so I didn't feel it was that intimate. Of course that is only because I know the context, and now I understand how it may look to someone who don't.

If you don't have her permission for such a an intimate image, how could feel good about exploiting it?

The same way I see other people uploading photos of sports people taken in public events. If I recall correctly, one of the big 6 even encouraged this with something like "there's plenty of ways to photograph a football player without showing his face".