This is a common type of response from me, but nevertheless...
You have multiple options for doing that.
1) Set field can copy container field data from one container field just like it can data from other field types.
2) Calculation fields can select "container" as the result type, so you can define a calculation with If or Case that selects for different records/fields in order to selectively return the contents of different container field images.
3) Since your data is stored in related records, your three container fields could simply be fields in one row portals or fields from the related table placed directly on the layout where relationships and/or a portal filter select for a specific related record in order to show the container field from that related record.
Yes, number 3 is something I did not even consider. Makes total sense. Its is also good to be clear on the other 2 as an option for when needed. Thanks!