Hey JasonTong!
I had to join this board to be able to post and say something about flute playing when you have a prominent tear drop.
First of all, I never even knew I had this lip shape until a new flute teacher looked at me once, and told me that I never would be able to be an accomplished flute player because of the big full lips and the tear drop on the middle of my upper lip. I was already playing out of the side of my mouth by then, and she thought that this was a terrible thing. She tried to retrain me. It was a huge mistake.
Practice and adjust, practice and adjust until you get a sound out that sounds clean and then repeat! It's the only way. Don't worry about what you look like, because the sound is what is important. Don't strain yourself, allow your mouth to be relaxed. I still find my mouth muscles tensing sometimes to get higher register sounds out, but I think that's normal to feel
I want you to know that I'm half asian, and I inherited my mothers full lips which look much like yours. I have been playing flute for almost 26 years and studied all through college for flute performance. I looked a photo of myself playing when I was young and I was playing out the side of my lips rather than the center, and that's exactly how I still play today
Or is it decent at least? :O