When you get the job and take the Forgery training in the museum, you get the key to the supply room, where the sixth piece of the Dragon Face picture is. When you leave the museum, it is night and you must re-enter through the Dragon Face hatch in the underground.
Once you have all of the pieces, enter the underground through the exit at the Docks.
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Locations of the Dragon Face pieces:
The City Docks : top of the boat mast
The City Docks : in the sand to the far right
The Museum : on top of the museum
The Inn : above the street artist, near the roof
The Underground : in the arch where the bulb is hanging
The Museum : in the Supply Room (must take Tour, get job)
it cannot turn into nightime before you get the final peice of the dragon
You go to the city docks and enter it from there
On counterfeit? If so you don't need to, that is just a light switch.
Counterfeit IslandNo, Counterfeit Island is real. In fact, it'd be better named as "Art Island".
You do not die on Counterfeit Island.
there is no mansion on counterfeit island
There is no camera as an item on Counterfeit Island.
You will have to swim for it : the lighthouse is on Big Nate Island, not Counterfeit Island.
you go back on counterfeit island
Yes. Counterfeit Island was the tenth, and Reality TV is the eleventh.
the curator isn't on counterfeit island... shes in early poptropica...
There are no snowballs on Counterfeit Island. (see the related question)