Journalism/AP style writing question

When should you use an exclamation point?

In contour drawings crossing lines is one way to indicate this

How did the artist illustrate his disapproval for city life through the painting above.

A2l punch recipe calls for orange and ginger ale in the ratio of 2: 5a) how much orange juice will you need? b) how much ginger ale should you use if you need 5l of punch?