Restaurants think about more than just whether to add pretty pictures when they're designing a menu. Their menu is an extension of the restaurant brand. If someone sees your menu in the window or online, they should get a sense of what the establishment will be like. Always include mouth watering imagery especially for high tickets and Limited Time Offerings. Never include dollar signs.
Ultimately you want to create a hearty menu that pays homage to the brand and the offering. Great, now I'm hungry.