You could look at it directly as a presentation and discuss the different types of food being shown in each of the photos.
You could print off and laminate the photos to make an interesting, eye-catching display about different types of food.
The students could also take the laminated photos and sort them into the different types of food. The students can then order them from the least to most healthy.
The photos could also be used as prompts for creative writing, factual writing or descriptive writing.