FaceFilter's main window displays the application menu and tools panel and allows you to select the image you want to transform. 

In the Fit Facial Mask window you have to follow the marker points and fit them on your image as the guide shows. 

In the Select Expression window you can choose one of the many templates provided by the application or manually adjust the proportions. 

The Manual Adjustment tab allows you to modify the proportion level and the head width to get a truly new picture. 

The Export window enables you to export the resulted image to the location you want.