How To Make The GSP work clear?

Why is it important to make your work clear in GSP? How To Make The GSP work clear?

Why?
1. So people now where is the start and where is the end.
2. So that people can easily to understand what you're trying to say.
3. So people want to read or look your work
4. You can get a better grade!!!!!!!!

How?
1. Make the label big
2. Make X and Y axises thick
3. Put the different problem into different color, but not too many color.
4. Separate the label from other label.