My students were all kinds of intrigued by the famous National Geographic photo of the Afghan girl (Sharbat Gula, photographed by Steve McCurry in 1984). I collected their comments on sticky notes that I kept on the back of the photo. I'll dedicate a post to that alone, stay tuned.
The painting display didn't capture nearly as much attention as the photography one, which made me a little sad. Maybe I'll do a bulletin board that is titled "Photo or painting?" and put photorealistic paintings next to photos, or photos that mimic paintings (like Yasumasa Morimura's photos that look like Frida Kahlo's paintings, for example).