#4 Focus on the dominant eye
This is particularly important if you’re shooting with shallow depth of field. Be sure to focus on the dominant eye of your subject, the one that is closest to the lens. If the dominant eye is out of focus, your photo will end up looking slightly off. This can ruin an otherwise good portrait.
#5 Keep your lines straight
Crooked horizon lines can give your portraits a weird look, so make sure to keep those lines straight. The same goes for environmental elements like doors and the edges of buildings. If these types of lines aren’t straight, it can give your portraits a tilted look that isn’t flattering. Of course, you can straighten important lines in post-production, but this will involve cropping, which may ruin the composition. Focus on getting it right in camera.