Have each child pick their own color and tally to see which you find the most of. When you return make a bar graph showing the colors and number of times each was spotted. Make up stories about the pictures as you look. Use a tape recorder and write them down when you return. If their is a postcard of the painting, purchase one to go with or search the internet for a small copy to go with your story.
Children can also draw their own version from memory when they return.
Bring a sketch pad and draw your favorite drawing. Listen to the children's comments on the paintings. If they notice the weather look for what the weather is in another painting. If they notice someone's high shoes or fancy hat, look for high shoes and fancy hats in other pictures. Talk about how the people or animals in the paintings seem to feel.