the quarry

how do you open the safe that has diamonds hearts and spades

you have to get the last key in the pirate painting in the house- the painting frame tells you what way the four keys go to to get the cemerty gate open. the 4 keys are
1- in box in shed
2- in box little girls room
3- box in attic with orange and blue lock
4- in pirate painting in house by closet door. (on first floor)