1. Give a summary of what you see:
There is…
There are…
The picture shows….
2. Talk about where things are
In the background…
In the middle…
In the foreground…
3. Add details:
What do they look like?
What are they doing?
4. Speculate:
I suppose it might be some kind of…
Maybe/Perhaps…
It must…
(He) might…
It was taken by…