Many people requested this effect because they had many difficulties with it...
The "real" problem, using the pen-tool, was sometimes the
major error, but once you get the hang of it, this tutorial will be a
piece of cake!
1st, the pen-tool! The pen-tool is the most detailed and
precise tool there is. Unlike the polygonal-lasso tool, this tool DOES
make curves when you want one!
Experiment a little with the pen-tool before starting this tutorial to see how it works...