Free spot the difference ESL worksheets are a fun activity filled with many of our friendly characters that can be enjoyed by all skill levels. Before circling all 10 differences, have your young students point out all the objects in the picture to help them improve their vocabulary. For more advanced students, adjectives can be added to describe each object they see, is it big or small? is it blue or green? Later, students can also form sentences to describe all differences they see in each picture.