STAGE 2
When I have finished drawing the main lines, I can add more details(not too much because we won't see much when we add the color). I just have to complete the sketch. At this point, you can say you have made the most dificult part. After, I just have to add color and coal and white chalk. When I bought the black chalk, it was written "coal". I know it's not charcoal because it's not a burned tree branch. I think it's mostly real coal that have been reduced in powder and been mix together to give sticks. It's very not expensive and you can find that in any artist shop. I'm just telling you that this gives the best effects for shades. No other chalk can be better. You get the REAL BLACK, not any dark, dark grey, no! This is very black, but when I'm saying black, I mean BLACK!
I only take a sheet of toilet paper and all I have to to for great shades, is to rub on the black. I can shade off the black in few seconds and it gives a natural effect. All you have to do to make lighter parts is to erase. Maybe you have other methods you prefer to make shades or any part of the drawing, but me I prefer a lot more the technique I explained.
Well, I would like to know your methods. I'm talking about the coal, but this comes further. Now my base structure is made: all the rest will be built on it.