How should you complete the relevant code?

Explanation/Reference:
var object = new SP.UserProfiles.PeopleManager(context) initializes a new instance of the PeopleManager object.
getMyProperties gets user properties for the current user.
SP.UserProfiles.PersonProperties represents user properties.
PersonProperties.pictureUrl property gets the URL of the user’s profile picture.
http://msdn.microsoft.com/en-us/library/jj667813.aspx
http://msdn.microsoft.com/en-us/library/jj712733.aspx