Your voice is lovely, no doubt about that. These are just a few bits of advice, as I made the same mistakes myself when I first performed this. Make sure you don't rush the piece and follow your rhythms. Focus on your intonation. You fell flat on notes for the majority of the piece. When singing the melisma, stay light and make sure each note is defined and they don't blend into each other. Keep up the good work, you have a talented voice with a lovely vibrato. With practice you will perfect it.