Improve accuracy in snapchat filter challenge

I have submitted my result and I got 85% accuracy. I thought it was good until i saw people with 100,98 % accuracy.
Things I have done:-

  1. Read the images
  2. used the classifiers
  3. Resized the glasses and mustache according to the width of the box that was generated by the classifier keeping the width-height ratio of the images unchanged.
  4. Replaced the background image pixel with the new resized foreground image inside the classifier generated box.
    Can someone tell me what can I do to improve my score accuracy?