text: Title: Optimum Image size
  Body: * face_recognition version:1.0
  * Python version:3.5.3
  * Operating System:Windows
  
  ### Description
  
  Wanted to check what is the optimum size of the image. This should depend on the CNN initial input nodes used? 
  
  also how will the number_of_times_to_upsample parameter can get tuned defaukt is one. But should be use 2,3,4,...
  
  Also while using dlib.shape_predictor("./shape_predictor_68_face_landmarks.dat") I can detect faces but when using the same Box to face_locations no boxes were detected
  
  ### What I Did
  
  ```
  Paste the command(s) you ran and the output.
  If there was a crash, please include the traceback here.
  ```
  