@ BadG3r

in almost all cases the ability to draw from the mind will not just appear like that. What is required is practice, practice, and more practice.
You will have to draw from reference before you can draw from your mind freely.
If you are interested in drawing characters anatomy etc. do life drawing and do it on a regular basis and use what you have learned when you draw from your mind. Using a mirror for poses can help as well.
From my experience drawing tutorials can deliver technique, and give some good tips, but they will not teach you how to draw.

ps: hope this is the right language... Gottfried Bammes "die Gestalt des Menschen" ist ein exzellentes Buch um Körperanatomie zu studieren.

viel glück.