At last I found Mandarin Blueprint…
At last I found Mandarin Blueprint where they explain exactly what I was asking my Chinese tutor from Beijing so many times. She did not understand what I was asking for when I wanted to know e.g. the position of the tongue. You can find all of that here. I really feel that I have improved my pronunciation by Pronunciation Mastery of Mandarin Blueprint. I’m very grateful for that. Go for it!!