Infantry/figure packs usually contain 8 x 15mm pieces/figures. This will either be 8 figures in three poses or eight castings of crew and weapon. Mortar and MMG/HMG packs usually have two weapons and six crew figures. This gives enough for two bases/teams of the weapon.
Artillery pieces are sold singly without crew as are tanks and other vehicles. This is because we have a variety of crew packs that suit each gun type. You might even want to use it as a captured gun.
Prone figures usually have a "smoothed face" i.e. little facial detail. This is because the undercut for a face smaller than the headgear would tear the mold as you pull a larger object (helmet circumference through a smaller hole, head cavity). Other manufacturers who try this often have torn molds. The face will not be visible to the gamer standing above the figure anyway.