The internal mix is when the air and the paint both mix inside of the airbrush. This will create a atomized fine dot spray pattern. This makes the internal mix a good choice for fine detailed work in your airbrush art. The point at which they come together is in the head assembly. The external mix is where the air and paint come together outside of the head assembly or the fluid assembly. Imagine being able to create realistic eyes on a dragon you just airbrushed onto the hood of a small model car? When a person looks strongly at your artwork on the hood of the model car they can really see the capacity of the skills that you have as an airbrush artist. Or imagine that no matter what size your project is, even the fine details are brought out to the point that they demand to be noticed. After all how can your create great airbrush art if you do not truly understand your airbrush equipment? Take the time to gain knowledge of all the parts of your airbrush will help you to learn how to properly work your airbrush and also how to take care of it. If your airbrush is internal mix then it will have a needle. Don't depend on just a couple of pictures on one or two sites to get you known. Myspace is also a great way to get seen and gain some exposure. With myspace you can create a profile that is dedicated to you as an artist. Upload pictures of your work and take the time to create a couple of videos as well. If you are doing a stencil for say a dog then you would want to take your time and make sure that the eyes were the same size, the nostrils were cut out shaped the way they should be and so on. If you rush you could end up messing your stencil all up. The stencil is to aid you in creating your airbrush art and is a big part of the art process. When doing airbrush art in the form of body art or tattoos you can use paint that is usually termed in two ways. Usually this paint is referred to as body art paint or airbrush tattoo ink. Both forms are basically the same and maintain a realistic tattoo look. This paint will last and is waterproof. To remove you will either just let time take its course and the tattoo fade or rub with baby oil to remove.