Ah, so desu ne~.. Anyway, I think you can learn about the framework/skeleton sketch when draw something.. It could be useful, I think.. Perhaps, I think you have a very good basic and talent.. Keep it up, buddy..
Thanks, shading is very simple, i used only on neck, i choose one light source, if you look i eyes, you will see where it comes from. Also i don't shade the hill of the neck (lol i don't know the english word but i think you understand it) and its easy and look like cool ^.^