This quote.....didn't get it.

[Gargs]

“I think it was the first time in my life I ever felt like I looked “good”. Do you know what I mean? That nice feeling when you look in the mirror, and your hair’s right for the first time in your life? I don’t think we should base so much on weight, muscles, and a good hair day, but when it happens, it’s nice. It really is.”
Quite didn't understand why there's a question mark.

[Ficie]

It's because "Do you know" (from the previous sentence) is implied. I guess the author skipped it just to avoid repetition, and because the book is written in colloquial style.
You can read it as "(Do you know) That nice feeling when you look in the mirror, and your hair’s right for the first time in your life?"

[Gargs]

Ok. Thanx.