Yup. Because it just shows that you actually care about their reactions to you. And that you actually like them and that they at least mean something to the guy. Because if the guy said that he liked the girl but had basically no reaction and the girl would obviously see that; she wouldn't want to date him because she'll think that he won't care about her.
Yes!!! xD 1. If you are shy, then I feel like you already like me. So, I can have a little confidence boost. 2. If you make a couple of mistakes, I feel like I can relax and have a little room to make a couple of my own. It makes me feel comfortable and like I can be me and not stress over being perfect.