a person who spends money foolishly or is easily deceived into overpaying

head-and-shoulders photo (especially a formal one used in a passport, ID card etc)

the boss

photo booth sticker

a short nail or pin with a large, flat head used for fastening paper to a surface

indicates that the most significant, difficult, or substantial part of a situation is yet to follow; the worst is yet to come

a low-ranking soldier or, by extension, a low-level employee