Video quality: 80% Audio quality:20% >>> background music is not for education video! Content quality: 100% Avatar video: 80% >> a small size circle frame and good light looks better! Color quality: 80% Outline quality: 100% Streamlining: 100% Dress code: 100% Lovely appearance: 100% Correct Word usage: 100% Total dynamic image presentation time / Total video time: 50% >>> you need to use images and videos to present your idea! Total author face presentation / Total video time>80% >>> best practice is >> very bad!