Stick to a theme that connects to the song, use appropriate lighting for the mood of the music, and include some footage of the artist or artists. Keep the camera close enough to see what's going on, use a variety of shots and angles, and make it interesting to avoid boring the audience. Don't keep the camera stationary on one point, shoot from too far away, rely solely on equipment over skill, completely mismatch the music and video, or overuse stereotypes.