Thumbnail is basically sketches before you proceed to proper stage called storyboard. As you might noticed, the story changed in every version and some shots were deleted or cut down. This is simply the function of a thumbnail: to visually tell a story based on the script and also to show us if the story is way too long. Camera angle/shots however is a option to be finalized.

These are the thumbnail sketches for our story.

First Thumbnails

Second Thumbnails

Final Thumbnails