I want to display or update  pic  awhen ever i want Example in linekedin there is profilepic where we can change our pic when ever we want like wase i want to update in community using lighting component


#Thanks in advance

Our notes & attchemnet are accessible through files(ie ContentDocumentLink replacement of attachment object), As we can not access/get attachment through lightning experience.
reference: https://help.salesforce.com/apex/HTViewSolution?urlname=Attachments-are-not-returned-in-Lightning-Experience-search&language=en_US
I want to display the attachment(image file) on lightning component, How can I display it?
I tried following code :

<apex:image url="/servlet/servlet.FileDownload—file=06941000000SKtyAAG" width="50" height="50" />  
 <apex:image url="/servlet/servlet.FileDownload?file={!attchmentId}"/>