code: def drawpoint(self, x, y, colour = None):
          
          self.checkforpilimage()
          colour = self.defaultcolour(colour)
          self.changecolourmode(colour)
          self.makedraw()
          
          (pilx, pily) = self.pilcoords((x,y))
          
          self.draw.point((pilx, pily), fill = colour)
docs: Most elementary drawing, single pixel, used mainly for testing purposes.
          Coordinates are those of your initial image !