Microsoft Windows team explain about Win 8 picture password feature.
Now we are having three login options
1) Just normal user login same like other windows versions
2) Login by enter pin code (Four numbers) same like ATM pin code.
3) And the best one is Picture password login (it recognize gestures)
This Picture password is new way to login protection. We have to set Three gestures in settings page. After next login onward we can see picture on login screen. Once you apply gestures it will login. We can quick login using password and Pin code (other ways) we can see this option in sidebar.
Please check YouTube Video