Yes, Redmi Note 6 Pro does have the face unlock function as well.
Yes, Redmi Note 6 Pro does have the OTG support.
Yes, Redmi Note 6 Pro does have the eye protection mode.
Yes, Redmi Note 6 Pro has a dual camera on both sides of the phone. At the front, you will get 20MP + 2MP dual front camera and at the back, there is a 12MP + 5MP dual rear camera.
No. Redmi Note 6 Pro does not have the front camera LED flash but it's display works as a flash.
The Redmi Note 6 Pro has it all - great display, snappy performance, no-nonsense features, excellent battery life, and very good and hassle-free camera experience. And all this is available at an amazingly low price.