Just browes threw cumputer images until you find something you like...You can print it out on your printer and then resize the image to suit your needs.
Then just use your stylus to trace the picture to transfur the features and lines that you would like to tool. Practice a few times and you will probly see improvement with each practice piece. Extra facial and muscular features will really add to the depth and shadows you can get with tooled leather.
Hope some of this helps
Here is a Bighorn that I just put on one of my holsters.
![](http://castboolits.gunloads.com/attachment.php?attachmentid=97978&d=1393462700)