1: wppizza->layout : Display placeholder image when no image associated with meal item
2: use css (also see: https://www.wp-pizza.com/topic/customising-the-css/)
3: wppizza->layout : Enable prettyPhoto (Lightbox Clone) on menu item images

1: wppizza->layout : Which style to use: ->select “grid”
2: you will have to use a filter in your functions.php like so

add_filter('wppizza_filter_currencies','myprefix_currency_filter');
function myprefix_currency_filter(currencies){
$currencies['AED']='AED';
return $currencies;
}