Edit a representative image in GIMP using layers, masks, text, and the color profile required by its final use. Save the source project, export the delivery format, and inspect both on another machine. Make a late correction to check whether the source remains genuinely editable.
If the team receives files from another editor, test those specific files instead of assuming complete format compatibility. Keep originals untouched and document fonts or plugins needed to reopen the work. The quality of the handoff matters as much as the first edit.