FSeventhC said:
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Please note, that Danbooru isn't an imageboard for artists to upload their own art. We have no problem with artists doing that, but the problem is, that most artist react very defensive, when their art is rejected. It's better to use art websites like Pixiv, DeviantArt or even Twitter.
Approvers have to approve good art that they like. Your upload has several problems, that are hard to point out, because there are many. Take the legs for example: there is no visible connection from the legs to the hip. No shading or anything else that points out the line between both legs. The face, like most of the image, is mostly flat, without any depth. And the problem I have with the image are the arms, which are appearing to short.
Last point: If you're asking for feedback, we're not obligated to give you any. Danbooru is a site run by volunteers for anything and if you're rude to other users, don't assume any help or tips in the future.