Play with the order. Develop that theme in the middle section and restate it for a dramatic close. Tell a story. After you've ordered the scenes so they tell a rough story, write narration that supports this story. The narration connects the visual ideas in a logical progression so each scene flows easily to the next.
Some people prefer to write the narration first.
If that seems easier, do it. Think of it as writing the narration for a story on audio cassette. Later you can plug in visuals to illustrate this oral story. Keep the narration short and directed to your audience. You can also write narration one scene at a time.