The picture is not supposed to be a "shark face". It is shown only on private sites, but you can try the related links below.
If you consider the 7 teeth as all one row, the teeth that you press are the 3rd, 4th, 6th, and 7th counting from the left. (And then you press the nose.)
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There are 7 teeth in the door figure on Shark Tooth island. Each has a symbol in the ancient hieroglyphics, which are listed on Professor Hammerhead's journal page. Pressing the four teeth that spell "OPEN" in hieroglyphics will open the door. Press the 3rd, 4th, 6th, and 7th (from left) and then the nose. (see related questions)
In the underground ruins on shark tooth island, you need a code to open the stone door. It is the word "open" in the hieroglyphics from Hammerhead's journal. The journal page is on top of the ruins, and you can get it by climbing the vine to the first platform, then jumping left. The word "open" is spelled by pressing the 3rd, 4th, 6th, and 7th symbols from the left, and then pressing the nose.
In the underground ruins, you have to enter the word OPEN in the ancient letters, which involves pressing the 3rd, 4th, 6th, and 7th symbols (from left) on the face, then the nose.
because it's in a cave beside the tree with the annoying falling coconuts.go inside and fall in the water and get past the bat go up and there will be a shark face if you have the code you type "open" and your on your own but the bone is in the cave somewhere.
Climb the vine by pushing the large block over, then jump left to reach the roof. The page has the translation of the hieroglyphics, so that you can spell out the word "open" on the face in the ruins.
On the face in the ruins, use the Translation Page to spell out "open" in the symbols. The teeth to press are the 3rd, 4th, 6th, and 7th from the left, then the nose. (see related question)
you go and get the ingredients for the calming potion. That are behind the door then you go see the medicine man after you got the ingredients and he`ll make the potion for booga. Then you go and feed the shark the potion (which is in a coconut) and he`ll go to sleep. after that you go meet the hammerhead guy and bring him back to the island where your blimp is once you do that he will give you the medallion.
a face
it looks like your face
Spell the word "open" using the ancient symbols or hieroglyphics. On the face, you can press the 3rd, 4th, 6th, and 7th teeth (from the left, in one row), and then the nose. (see related question)
The translation key page is on top of the ruins, and you should spell "OPEN" in the ancient symbols. (Counting all seven teeth as one row, press the 3rd, 4th, 6th, and 7th teeth, then the nose.)