How to draw neat and tidy diagrams?

Whether in your practical copies or your Exams, the drawings and diagrams have to be labelled and neat. If you add some shadings and sketchy marks to them, the merrier.
Here are some tips and tricks to make your work look neater:

1. Never ever draw the diagrams in the middle of the page, draw them towards the left, so that there is space for labeling's.
2. The diagram should not be very close to the top or bottom, but rather in the middle. There should however be space for the main heading, which should be below the drawing, not above it.
3. Give the main heading double underlines, and the labeling's single underlines, in case you have shortage of time or space (sometimes the labeling's are too many). 
4. Make the line end of the labeling's prominent by darkening the ends of the line.
5. Always use a full stop after each labeling.
6. make the first drawing with a light pencil, so that it can be rubbed off, when wrong. Once the first correct sketch has been drawn, only then use a dark pencil.
7. Use a tissue paper or cotton bud to shade or blend the shade.
8. Make sure your hands are clean before starting the labeling. Often shading leaves the hands gray because of the lead, so clean them up before starting the labeling.