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These pictures are from a fastpack trip in the end of August 2003. On this trip we actually entered the Sisters loop from the Obsidian trail head (longer than this route). Therefore I don't have pictures of the start for the loop you will be doing.
From the trail head, travel 2.5 miles south on the PCT until you junction with Scott Trail (trail 4068). You will go by beautiful South Mattheu lake. This is the spot you'll come back to at the end of the day. From here you take a left and head out on trail 4068.
Not too far beyond this point you meet up with Scott trail (where you turned off in the morning). From there it is just 2.5 miles north on the PCT to your car.