It is beginning to look much better.  In the Material room there are 2 modes of selecting nodes for copying.  First mode, right-click to open the menu and click on 'Select all'.  The node title bars will change color hence become selected.  Second mode, manually select the nodes by holding down 'Ctrl' and left-clicking each individual node.  When you right-click for the menu to copy, make sure that you click over the title bar of a node.

Once all the Gc is done, you can start turning down light intensities to your liking.