Research!
A Wide Range of Stamps from Ireland to Sierra Leone!
* Sierra Leone invented the first self adhesive stamp!
Some stamps are playful, light hearted and others are intricate designs with lots of information.
Look at the SHAPE of the stamp! Not all stamps are rectangles - Some here are circular, Triangular and even heart shapes (very last image!)
Consider the LAYOUT also - where is the information placed (literacy and numeracy - Eire 60c and even possibly a slogan/some writing)