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Image in User Object

For generating proposals I need a signature as grafic (or link to the grafic)
in the user object.
It would certainly be possible to generate a custom field with type text(18)
and load in the id of the tif stored as document in Salesforce.
However the customer will maintain Salesforce users in future on their own 
and needs a possibility to link a user and an image document together on
his own (and not programmatically). How can I do this?
Thanks for help