Instead of legacy form fields, use Content Controls.
For your repeating picture, use a mapped picture picker Content Control or Rich Text Content Control.

• Mapped Content Controls by Greg Maxey
• Repeating Data Using Document Property Content Controls and Other Mapped Content Controls
• Repeating Data (Populating Multiple Like Fields) by Greg Maxey

Why are you using legacy form fields? I am assuming that it is because that is what you learned.

Greg's utility will convert them to content controls.

• CC⁄V⁄BM & DP Tools Add-in by Greg Maxey, MVP and Graham Mayor
• Content Control Tools by Greg Maxey