How to access individual items in $form_state['values'] post-submit
You can access $form_state['values'] of a field in like 

$variable = $form_state['values']['your_field_name'];


After saving you can access like this

$variable = $form['your_field_name']['und'][0]['value']; 


For more information please check


$form_state keys
What is $form_state used for ?


Hope this will help you.