Like above said, you've got to get those knees back.
Try some Romanian deadlifts, to practice getting your hips back and loading up your hamstrings. You looked really uncomfortable when lowering the bar, especially when it was around your knees.
Keep your chin pressed forward when you snatch. This keeps your head up and back straight.
Don't watch yourself in the mirror.
Check out these power holds. You can train different parts of the lift, without having to do the whole complex move.
Extension power hold
you've got the basic idea of the lifts right. You just need to get more experience and practice.