hi indeed i am not expert for this to say the least but apart from numbers explaining potentially the rejection, i tend to believe that your preview and presentation are just not selling … maybe a wrong selection of captures or initial images …
My opinion is that the action is not bad but presentation image not good (looks too childish). Add more detail and contrast to your photo (this way everything looks kind washed out) and different way of presenting I think it would be ok. Change name and add some things in action to look better if it’s a hard reject.