Even from this tiny thumbnail I can see that it's cropped too tightly - you've cut off the edges of the object. It also appears to be blurry, but a full-size image is required in order to confirm that.
That's not the reason why Adobe refused your submission, that's the reason why we can't check the issues with this asset. Please post the full size picture as submitted with stoch and you will get qualified analyzis from seasoned contributors. And please add the refusal reason. The heading will be enough.