I hope you have found these tips useful. As I mentioned above, I have had to generalise which is always a very dangerous game to play, however, the above have served me well to blend in unnoticed despite my overly English appearance! I do have the advantage of speaking the language of course, but I have found that by embracing the customs everywhere I have been the locals have embraced me, enriching my experience way beyond just seeing the beautiful sights of Spain.