your pics are OK for first time out...Your staring down the camera is great, right on, but you have to learn to do that while keeping your facial muscles relaxed and confident. Your anxiety and nerves shows in your tensing of your your lips and your jaw ... you got to keep the face relaxed and have all the intensity in the eyes. look at any good modeling pic, the eyes are direct and focused, but the face is relaxed, confident. Its about confidence and it will come with more experience in front of the camera.