The coffee cup looked good. So did the morning light.
For the first few seconds, the scene worked. Then it just... stayed there.
Nothing was technically wrong. The cup was still in place, the lighting was fine, and the shot looked clean. It simply had nowhere to go.
I noticed this while sketching out a longer clip with Wan 3.0. I kept adding detail to the prompt, but that wasn't fixing the empty middle. The problem wasn't a lack of description. I hadn't decided what should happen next.
Give the scene somewhere to go
So I stopped writing the prompt and made a rough note instead:
Cup by the window → hand picks it up → rainy street comes into view → cup returns to the table.
That was enough.
Now the scene had a beginning, a small change, and somewhere to end. Details like steam, warm light, or depth of field could come later.
This also stopped me from trying to fill every second.
A longer clip doesn't need constant action. The hand can pause with the cup. Steam can drift through the light. The camera can hold on the final frame for a moment.
If nothing useful needs to happen, adding another movement usually doesn't help.
Watch the whole thing once
When I have a draft, I watch it from beginning to end without stopping.
Where do I lose interest?
Does anything happen twice?
Is a camera move helping the scene, or is it just movement?
Does the ending feel finished, or does the clip simply stop?
Only after that do I go back and inspect individual details.
I still do a second pass for the boring-but-important stuff: readable text, logos, product details, factual claims, and anything involving recognizable people or voices. If something looks convincing, that doesn't mean it's correct.
Since trying this approach, I've stopped asking how much I can fit into a longer clip.
I decide what actually needs to happen first.
If the idea only needs 18 seconds, that's where I stop.