I'd like to mirror what everyone said: Very well done, lovely voice, I really enjoyed listening to it.
If I wanted to put in a teeeeny bit of constructive criticism: The mentioned confidence didn't last until the very last note, you were already starting to 'switch off' a bit before the song was finished and looked as if you were thinking: 'I was so nervous, I'm glad I made my way through'
Always hold the concentration until the very last second, even if you already stopped singing - the song isn't finished until the last note of the accompaniment has been played.
I'd also second rosfrog's thoughts on muscular support/anchoring.
Other than that: Really well done, you can be proud of yourself.