...
Each image uploaded is registered in the database n in a table called "facelist_multipart" using the patient id of the corresponding patient and in later versions, this registered id will be used to control the upload of patient image to patients who already have face or who have null .
...
the omod can be downloaded from https://bintray.com/mozzy/omod/facelist/1.0.0
and the source code found at https://github.com/mozzy11/openmrs-module-facelist
...