-Through the path on the far left, to the fence
-and then near the bottom on the left corner
-To the left of the last gnome he'll be sitting on a pile of wood on the 
 lower edge
-To the right of middle gnome he'll be hiding in a drain pipe with just 
 his eyes showing
-near the drain pipe there's another pipe on the wall, behind that one is 
 another gnome. this one takes a little bit of pixel hunting to find him