1. Practice, practice, practice!
2. Keep all old drawings, no matter how much they suck. You can look back months later and see if you've how much you've improved and if you improved at all.
3. Put your drawings next to a mirror. This will help you see any faults in your drawings.
4. Let others criticize your artwork. They can be helpful in seeing things from a different perspective.
5. Go ahead and "copy" other artwork. (When I mean by copy, I mean draw the same thing). See how close you can get your drawing to look as same as the original. Although it is okay to do this, do not take credit for something you copied. Magazines and cards are great ways to help you be better.
6. Use models for your drawings (example: still-life, animals, people). It helps if you're looking at what you're drawing. It is often harder to draw something out of the blue.
7. When you think you are reasonably good, try and develop your own sense of style. You don't want to copy other people's style. Artists like Yu Watase (Fushigi Yugi) advises people to not copy her style.
8. Graphing something out is a wonderful way to start drawing. It helps you pay close attention to things like detail.

First, you have to select a picture to draw. It is easier to draw if you have something to look up and see how they drew that picture. Second, you have to make the grid on top of it.(I know it is such a bothersome task but it helps you draw the picture just like orginal.) About 0.1mm is best for postcard sized picture. (Its size can be different by the size of the original. You can easily figure it out.) Third, you have to get a white paper, and draw same numbers of grid on your original. That way, you can draw the original any size you want to. After that, you have to try and practice, after a while you don't even have to draw grid.(You can kinda estimate it by that time.)