Does either the mother or father have dimples

Since Manny's dad also has dimples, it was pretty much a surefire outcome. Since dimples are a dominant trait, only one parent needs to have them. If you or your partner has dimples, there is a 50% chance your baby will have them.

Explanation:

Dimples are a highly inheritable trait. ... “A dominant trait is one that you only need one gene copy (from your mother or father) in order to get the trait,” says Dana Bressette, a molecular geneticist and university genetics instructor

The paint symbolizes the savagery which Jack's tribe has descended into. The face paints are, made of earth, real, and their effect is real too. The paint serves to reduce the boys to almost animal like status, concerned with the basic fundamentals of life, killing, eating and shelter from wild beast and enemies. Ralph's desire for smoke is insubstantial and it represents something insubstantial too, the possibility of rescue and the return to a so-called civilised world.