Sure, here are 10 useful features to distinguish airport terminals in a photo:

1. Signage: Look for signs that indicate the name of the airport or terminal, directions to various gates, or services available.

2. Seating: Check the type and style of seating available, including benches, chairs, or lounges.

3. Architecture: Observe the design and style of the building, including the shape of the roof, columns, and other architectural features.

4. Lighting: Look at the lighting fixtures and the amount of natural light available in the terminal.

5. Retail and dining options: Check for the presence of shops, restaurants, and other services.

6. Flooring: Look at the type and quality of flooring, which can range from carpet to tile or even marble.

7. Baggage claim area: Observe the area where passengers pick up their luggage.

8. Security checkpoints: Look for the presence of security checkpoints and the type of security measures in place.

9. Airline branding: Check for the logos and colors of different airlines to identify the terminal.

10. Technology: Observe the types of technology available, such as self-check-in kiosks or digital displays.