There are of course rules, always rules, but I wanted to do what I wanted to do, so I did.
They take a long time to make with all that shading. I made them with biggish eyes, because I liked them that way. Now I haven't made any for years, these are a few of my old ones.
When I get time, I will try to make a few more. They were made with the Software Programme called Paint Shop Pro 7, which I still have but they can be made in most Paint programmes.