Can we get a consensus as to what the 4 symbols are on the Indian's pants?? Is it C 1 X (then there are left and right arrows)? Or is the 1 an I?
I agree that it is c 1 X. My best guess is that this hints that colors (c), numbers (1), and letters of the alphabet (X) are keys (see his other leg) to decoding the puzzle. This may complement the clue on the treasure chest on page 7.