Two things you need:
1) You need to create a dataflow dependence between the loops you show. Stub an error wire from the Draw Area Size Property Node or something like that which prevents the copy/paste for loop from running until after the pictures are created.
2) Insert the SaveAs method into the error wire which exits the copy/paste for loop and enters the Close function. You can use the usual file path controls and functions to generate the path and then use path to string as input to the invoke node.