What's my best side?
When taking a portrait of someone and you want to be sure to get their right side, ask them to take a selfie with their phone. They will instinctively point the phone camera to what they perceive as their best side and that's the most important thing. The customer is always right!
Then you will know their (perceived) best side and this will help you get 'their best side' when you take the photo, which will save numerous reviews of every photo you take and having to try different shots again & again.