Vanilla Bean Panna Cotta

I was drooling when I saw the picture of David Lebovitz's Perfect Panna Cotta on his website. It looked perfectly smooth and silky, made me wonder if it tastes as good as it looks. So I tried to make it myself. But the problem is, I couldn't unmold my panna cotta, it stubbornly sticks to the cup. Feeling disappointed of not being able to get the silky look, I just took a picture of it with the cup.
About the taste, I think it tastes similar to milk pudding that is made from agar or jelly powder. But I think I like milk pudding better than panna cotta, because the taste of gelatin is just a bit weird in my tongue.

Panna Cotta Recipe