I found this tutorial on the net, to crochet a bear and mount it as a brooch.
You need 2 big circles and 2 small, easy.
And then my daughter, can't remember which one, said it looked like a pig....maybe because of the colour of the cotton !
Anyway I wore it once and got some interest, so I can say that it is a ..nice .. bear.
You can find the tutorial on Folksy, the author is Irenestrange, and it is called an amigurimi bear.