The mods/janitors will see the comments when they look at this for approval; they'll note that this is a duplicate of post #1411984 and not approve this one.
plalomar said: I'm sorry, I accidentally press submit again while I going to find similar.
How should I tag for delete?
If you just want to look for similar images, use this site: http://iqdb.org/ Then you shouldn't need to worry about accidental uploads.
As far as deleting it, it will be deleted automatically after 3 days, so you don't need to do anything. In this case, a Mod has just deleted it manually, though.