Thank you for writing. The first image you definitely need a model release for. Even though you can't see the entire face of the child, he is clearly identifiable. You will be better off to err on the side of caution and obtain a model release if it's even a slight possibility the person can be recognized.
The 2nd image, if it's sharp at 100% the moderator could have selected the wrong rejected reason. Reviewing images is a subjective process so you may find different opinions. Personally, I'm not crazy about the general composition of the image. I also feel the statue is a bit underexposed and the sky is a funky, unnatural color. I don't see this as having much potential for stock unfortunately.
The last image..again, this is a subjective process. I feel the overall image is not appealing. The image in general appears to be a bit muddy and needs some more pop. Ask yourself what a customer would buy that image for.
I hope you find better success with your future uploads.
Thanks very much for the clarification and critique.
(retired) President / Creative Director
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