Remember to think like a business-person, NOT an artist at this point. Your ideal goal is to present work that has plenty of reasons why it should be accepted and none or very few why it shouldn't. If not, fix it up. Make your human subjects relax. When shooting people, try to make them relax and let their guard down so that the camera can capture the 'real' person.
Human beings see the world quite differently to the way a camera lens does.
What the great photographers have learned to do is thus to visualize the world like the camera. Communicate with your subjects. Aloof 'genius' photographers may exist in the movies but they don't get very far in real life. Talk, communicate, be inclusive and approachable with ALL your subjects ALL the time - it's the hallmark of a professional. Egos can be left behind in the car.