A very basic skin template. Note: If you view the files, you'll see a dark and a bright "version". The dark one is the outer layer. This layer was thought to be used as "clothing" and you can toggle parts of this layer on and off in your Minecraft options. If you don't want to maake use uf this (cool) technology just use the left side!
By the way: Creating skins in PMCSKIN3D or Blockbench is so much easyer than using paint or something like this! But if you want a template: Here you are!