Find a subject that could be made into a negative space mark.
There are certain subjects that can be made into a negative space mark. In principle any idea will work that has a background (positive shaped space) overlapped by foreground (negative space shape). In my case things like hands holding something or animals heads overlaping their bodyes work the best.
Execute the mark patiently
Try not to settle with the result that you are not happy with. If you are not happy with the result, do not expect others to like it. Bystanders opinions are very important, ask them nicely to criticize your work and do not get upset at their opinion. Remember best marks have a universal appeal – so think of extraterrestrials as clients.