Your face shape has a big effect on what hairstyles, glasses and make up will be best for you. Once you know which face shape you have, you can see the information page for it and you'll get some information on what you can try.
FaceShape app is made possible thanks to the latest advances in the computer vision field. A machine learning model is trained over hundreds of millions of pictures. A subset of these images are manually labeled with the correct face shapes. Given enough time, the model is able to differentiate the face shapes with high accuracy.
In the picture you select, make sure you're facing the camera, that you're the only person in the picture and nothing is obstructing your face. Make sure to remove any glasses. Pull your hair back. Try a neutral background.
We are looking to make FaceShape app even better. If you have ideas or suggestions, create a post on our subreddit.