Show users pictures who have flagged a node I have a event node and a flag to join the event.
I want to show the user pictures who have flagged "Join event" 

This is what I have done so far

1.Created a Node View

2.Added a relationship Flags: Node flag (select the required flags
    and tick "Include only tagged Nodes"

3) Added another Relationship Flags : User 

4) Added Relationship "Content Author" 

4) Added contextual filter: Content: Nid > 
Content id from URL > Specify validation criteria > Flaggable = Join Event

5 ) Add field User Picutre

Many thanks for your help
I think you'll have to create a user view, displayed as a block, and use the flag relationship to the nodes. Then use a contextual filter, taking the node NID from the URL as default.