First. Read howto:upload
Uploading One's Own Art is Sacrilege
Posting one's own art is severely looked down upon, and there are two reasons behind this:
Firstly, artists tend to be biased when it comes to judging the quality of their own work. What looks good to you may be regarded as mediocre to Danbooru moderators.
Secondly, allowing posting of own work (self-posting) will cause a sudden spike of sub-par uploads as users mistake us for another Pixiv or Deviantart, far beyond the scope and capacity of Danbooru.
More suitable sites to upload your own art to include Deviantart and Pixiv.
Admins and moderators are especially harsh on self-posting artists, lashing out penalties without remorse. The one and only way to feature your art on Danbooru is to show immense talent and skill elsewhere, and with that, captivate some fans on the other side of the Internet into uploading your art.
Second.
Iikura said:
I seen much worse on Danbooru that was approved.
This argument is old and annoying and will likely lead to people ignoring your entire post. It's well known that the quality standards aren't as consistent as we want, mainly because so far as art goes, there is no strict definition of "quality". Just because some posts are really bad doesn't mean you are free to upload bad pictures (not that yours are bad, they actually seem decent)
Third. It's written above what you linked. 5 have seen it and didn't like it enough, meaning the quality was ok but nobody was specifically interested enough to put their name under it as approver. Since it's touhou, I actually expect it will get approved - less than half of the approvers have seen it so far
Hope this helps. And really, read the entire howto:upload, not just what I quoted