How do I get the crystal

Hint 1 of 9:

Notice the strange yellow markings.

Hint 2 of 9:

You remember what you did in Seattle?

Hint 3 of 9:

Use the yellow crayon on them.

Hint 4 of 9:

A copy of the drawing can be found somewhere else in the game.

Hint 5 of 9:

Have you seen a similar (but larger) statue elsewhere?

Hint 6 of 9:

Like on Mars?

Hint 7 of 9:

If not, it's in the great chamber of the face. You need to see it first.