How to distinguish Americans, Russians, French and British in appearance?

Americans, Russians, French and British people can be distinguished from each other in the following aspects:

1. Hairstyle: Americans usually have fluffy hairstyles, while Russians have neat hairstyles. French hair styles are more casual, while British hair styles are more formal.

2. Facial features: Americans usually have straight noses, while Russians have hooked noses. The French nose is relatively high, while the British nose is relatively common.

3. Skin color: Americans usually have lighter skin color, while Russians have whiter skin color. French people have dark skin color, while British people have medium skin color.

4. Pupil color: Pupils in France are usually blue, while people in other three countries are brown.

It should be noted that the above characteristics are not absolute, and there may be individual differences between different races.