On original Users Autocompletion Callback view the user picture field is not passing to JSON, but " \n\n\n" instead.
So the other image fields.
The JSONE view produses:
[
{
"fields": {
"user_picture": " \n\n\n",
"name": "admin"
},
"value": "admin",
"link": "user::1",
"group": {
"group_id": "\u0410\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440",
"group_name": "\u0410\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440"
}
}
]