One or two sentences that set the piece up. What it is, why it exists, what it was trying to do.
The longer story goes here. What the brief was, what constraints shaped it, and what decisions you made that mattered. Talk about the work the way you'd talk about it to another filmmaker — specific, not promotional.
A second paragraph if the project earns it. Process, a problem you solved, a moment on set that changed the direction. This is where a portfolio becomes a point of view.