You have some nice sketches here, I like exspecially the rendering of the >martian from "war of the worlds"< and that black ink flowers (?)
I have some suggestins concerning anatomy study ....
I know it's quite expensicve, but I think Gottfried Bammes: Die Gestalt des Menschen (Lehr- und Handbuch der Künstleranatomie) might be of some help for seeing what can be working and what not in anatomy and how skeleton, muscles etc. are playing together.
And you'll find a lot on feet and hands there.
Or study the studies of Leonardo da Vinci, Michelangelo, Duerer....there are so many ...it can be worthwhile
As you are living in Vienna I would also take advantage of the museums there - das Kunsthistorische Museums contains - if I remember right, a lot of statues... that might also help to improve your anatomy skills
hope that's of some help...
"The reason why truth is so much stranger than fiction is that there is no requirement for it to be consistent."-Mark Twain