Finally, let's create a Contextual filter - we want this block view to take its images from the particular node it is appearing on
Add a brand new contextual filter to your view, based on the "Content: nid" field
Select to "Provide a default value" for the nid in the event that it isn't passed on
Select to use the ID from the current node's URL (don't worry - this will still work if you have a node URL alias or redirect :-))