why my picture can't be approved

For artwork, you'll probably need to sign an IP release form saying that you are the artist, and it is not copied from somewhere/someone else.

Hi Jenny,

Please note that we are photographers and artists like yourself, and not review moderators. You will need to tell us the reason Adobe give for not approving the image. You can find this info below the image in your decline notification. Or click on More details. Otherwise go to your contributor page and click on Uploaded Files, then Rejected below the black menu bar. Then click on the image on the left of the page and you'll see more details on the right. Tell us what Adobe says there is the reason and we might be able to guide you in making the corrections to resubmit.

For me the image is a little pale, but that is a matter of taste and might not be the rejection reason.