People take good pictures not cameras. It's up to you to compose the shot carefully, making sure that the lighting is correct, etc. You can experiment by taking as many test shots as you like using various camera settings, compositions, etc. "Practice Makes Perfect."
To sharpen your footage is asking for the camera to compress the input, which produces a slightly jagged, or bit mapped edge. Setting your camera to un-sharpen provides a cleaner shot.
Sometimes you can have a frozen window, and there are two fast ways to solve this problem without turning off your computer or restarting it. The first is the traditional key combination of Ctrl + Alt + Backspace.