I think its safe to assume that the penut picture's hint which was previously was figured out (as-sulted) should be held in contecxt with the letter from Vargas who said "You'll understand me soon enough, son: the sound of a sea snake's neck snapping, the smell of daggermouth breath, the sight of Fremennik warriors battling back-to-back - it all puts hair on your chest" and since pete said that all the letter's were following the cHaOS Elemental's cue of hints.