So many things could and should get you tagged. Cheating the art contest, sending merits to your alt, and just deceiving users of this forum. Noone ever believes the it's my blah blah relations account and you admitted sending yourself merits. I see no reason not to tag you honestly. Even if the merit thing was overlooked, which it shouldn't be, you still cheated the pumpkin carving contest or art contest.
I am a very big advocate for cheaters being tagged. You are an adult and you know right from wrong and you are only sorry because you were scared of being caught. There is no remorse other than fear of not being able to use the forum freely. That IMO is not a valid excuse for your actions. You would never have told on yourself had you not been scared of being caught. For this I must treat you like every other cheater and tag you. Maybe I can reconsider the tag later on down the road, but we will cross that bridge at a later date.
Thank you for being honest, but you were not honest for the right reasons.