25A. 
                Many people are having a problem with the step 25. The 
                  several figures shown below should clarify any misunderstanding you have. I 
                  use a red color paper to show that all the pictures are related to one fold, 
                  i.e., the step 25.
                The step #25 is a valley fold.
                 
                Nowdays, there are many instructional video for helping you folding a standard rose. Two I can find from Google search are:
                
                  http://www.youtube.com/watch?v=E72E6rqCjRU
                  Watch carefully on 3:30 for the step 25.