For a starfish we'll need some serious preparation. If you have nothing to erase with, just do the listed steps mentally.
- Place a dot in the center and five dots at equal distance around it. Ideally, the distances between two neighboring dots around the central one should be the same.
- Connect the side dots to the central one.
- Place a dot between the lines at an equal small distance from the central one.
That's it for the preparation. If you did this in your head — hopefully it worked out for you.
All that's left is to connect the far dots to the near ones with a slightly curved line, and you get a star. After that, all the auxiliary dots and lines can be erased (or forgotten).
For beauty, you can add some patterns.