Taking apart a carefully built model can feel abrupt, especially when the floor or table is needed for something else. A photograph can offer a way to remember it before the materials return to their box. Ask the builder whether they want a record rather than assuming every creation needs documenting.
The picture does not have to be polished. A phone image taken in ordinary light may show enough. Keep the setup stable and photograph from a safe position; do not climb on furniture or move a fragile structure somewhere unsuitable just to improve the background.
Ask what should be visible
The child may care about a small hidden room more than the impressive front. Let them show you the part they want remembered. One overall image and one detail can be more useful than a large sequence of nearly identical photographs.
If they want to be in the picture, discuss how it will be used. A private family record is different from posting online or sending to a group. Follow the family's sharing boundaries and avoid including personal documents or other private details in the background.
Add the story while it is fresh
A short caption can explain what the model does or why a particular feature matters. Use the child's words if they want to provide them. A drawing or dictated sentence can serve the same purpose when a photograph is not wanted.
Store the image somewhere you can find it again, such as a small project album. You do not need a separate folder for every afternoon. Review duplicates occasionally so the collection remains something people can browse.
Make dismantling a separate step
Explain which pieces need to be put away and whether any part can remain for another session. A photograph does not automatically make a child ready to dismantle the whole project immediately. Give a clear boundary based on the household's needs and offer a manageable role in cleanup.
Sometimes no record is necessary. A construction may have been enjoyable precisely because it could change and disappear. The option to photograph should preserve a memory when that helps, not create pressure to produce something worth saving every time the blocks come out.