So, I've been including them in my uploads recently (under the "we'll accept any old sh1te" regime) given that RPI, even at 20% of what it was, is still not too bad  (relatively speaking).  More than doubled my port (which isn't saying much) in the last few weeks with no image quality rejects.  However, I have had one rejected for model release and have a half dozen sitting there pending model release (all 3d renders).  I had a polite reply from contributor relations who obviously completely missed the point I was making and no response on the subsequent clarification.   

Seems that model releases are a jpeg - should I just upload a jpeg with "this isn't a real person"?

I would guess it's an issue with rendering program and 3d models not that they think it's a real person bur you can send the rejection to scout with a note about how it was created.

Like you said that would only be the rejected one. You can't Scout unless there is a rejection, so if they're just held pending a release, I'm not sure what you can do.

I have also found that you can't get a re-reply from CR if they have misunderstood your question. Also if your question is in two parts, they only answer one part - which is common with CR people - it must be a faulty way they're trained.

Seems that model releases are a jpeg - should I just upload a jpeg with "this isn't a real person"?

That's another possibility. I've got a couple where I've uploaded a jpeg where I thought they might expect a release but none was needed. In fact, onw which was a recurring problem (some acceptances some rejections), I got an official email confirming no release is needed and copied the text into PS to make a jpeg from. Then in the description, I put a note to the inspector, 'No release needed, see attached jpeg', and upload the jpeg in lieu of a release.

I'm sure I've read that if you make up a vector 'person' up 'from your head', you have to take screenshots of different stages in your work, including a pencil sketch if you do one, and merge them into one big jpeg. I don't know how that actually proves that you made the person up from your head, but apparently that's the hoop you have to jump through. Maybe (?) that would help with a render (?)