Manji, I first want to say, your shading is beautiful.
Your comment about mechanical lead being too rough is true, there is a different chemical component and not enough clay to blend the carbon.
I'm not sure if you wanted constructed criticism or just to wow us with your talent so I took a long look at them before deciding to reply. I feel you draw your hands too small in some of the pictures, it doesn't distract from the image but they are a little dwarfed. Secondly the image half way down the first page the torso is a little too long and makes the character look gaunt. If those were the effects you were attempting, then congratulations, your skill is where it should be; if it is not the effect you wanted, perhaps studying a mirror or another person will help. I'm not sure if you draw from pictures or just from your imagination, but try to sketch from life if you haven't already tried it.
PS: what do you plan to do with your skill? is this just a hobby or is it to be your carreer?
My SUV is now the Enemy, look at my average life and nothing has been alright...
I'm preoccupied with 1985... (Bowling for Soup)