Wow. 你 have a gorgeous voice! 你 went slightly off-key every now and then, but for the most part, I was really impressed! Very nice use of vibrato! I'm gonna give 你 a little advice, but this is 更多 detailed because it was really great! 你 were a little off beat. It's really hard to be on beat without accompaniment, so it's not a horrible terrible thing 或者 anything. The only thing I could really suggest is to do a little more. What I mean was, it sounded amazing, but it sounded similar throughout. Maybe play with the volume a bit 或者 something? Overall, great job!