Fill the balloon with water . This image illustrates why you don't completely fill the balloon you should always leave some room in the neck of the balloon, then as the form dries the pressure has somewhere to go and your clay wont split like that.
Double Exposure Portraits by Antonio Mora L’artiste espagnol Antonio Mora fait portraits de femmes et d’hommes en double exposition d’éléments naturels : des vagues, des paysages montagneux ou des animaux et plantes vienn