On a procedure turn, do you make the turn on the inside or outside of the procedure turn?
Section 5-4-9 of the AIM contains a lot of guidance on procedure turns, and says (in short):


If the procedure turn is charted as a teardrop or hold-in-lieu of procedure turn, then it must be flown as charted. (Does not apply in this case.)
If it is a standard procedure turn, the barbed arrow shows the maneuvering side (so the first turn should be flown as indicated), but the rest of the procedure is at the discretion of the pilot, as long as they stay within the distance specified on the chart.


I was taught (and see it as a "standard practice") to turn away from the fix defining the start of the procedure turn for the 180 degree turn, and in fact have never seen anyone fly it the other way.  That being said, there is nothing which prevents it if it can be done within the protected area and accomplishes the purpose of becoming established on the final approach course in time.



A small excerpt from the AIM (lots more information is available there):


  5−4−9. Procedure Turn and Hold−in−lieu of Procedure Turn
  
  ...
  
  
  On U.S. Government charts, a barbed arrow indicates the maneuvering side of the outbound course on which the procedure turn is made.
  Headings are provided for course reversal using the 45 degree type
  procedure turn. However, the point at which the turn may be commenced
  and the type and rate of turn is left to the discretion of the pilot
  (limited by the charted remain within xx NM distance). Some of the
  options are the 45 degree procedure turn, the racetrack pattern, the
  teardrop procedure turn, or the 80 degree  260 degree course
  reversal. Racetrack entries should be conducted on the maneuvering
  side where the majority of protected airspace resides. If an entry
  places the pilot on the non−maneuvering side of the PT, correction to
  intercept the outbound course ensures remaining within protected
  airspace. Some procedure turns are specified by procedural track.
  These turns must be flown exactly as depicted.
  
  
  ...