From the official site's downloadables.

@theo1996

Please try to tag your uploads. See howto:tag. You should try to get at least basic composition tags (tower, flying, logo, 1girl, solo focus), and character description tags (long hair, blonde hair, witch hat, black dress, frilled dress, knee boots) that make up "Level 0" tags.

You should also put the actual place where you downloaded this image (or as close as you can get url open to the public) in as the source link. Not having a source makes it much less likely your image will be approved, and approvers will often just skip any images that don't have anything in the source field.