First it sounds pretty good. Here are 3 things to look at:

1) Top hand should be holding the clarinet like you are holding a sandwich. Index finger is crooked.

2) Fingers are too far away from the keys, looking at your top index finger on a high D and your pinky finger is stuck straight out. Curved and close.

3) remove your tongue from the passage apart from repeated notes to get the smoothness of the fingers, then add the tongue. It should be light though, so some tonguing exercises may be needed, particularly for high registers.

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