One of things I do as a graphic designer and illustrator is recreate really bad image files that my clients begin with into something that my clients can use. A lot of my clients need images in a vector format that they can then reproduce for various purposes, the most common being t-shirt imprints, posters and business literature. An image that takes up the front of a t-shirt is not going to look really good if it's just an enlarged jpeg image, but when it's been vectorized it is fully scalable to just about any size.
The image below is a file that I received recently with the request of being able to do something with it. The original image is pretty bad (though it's not the worst I've ever started with) and it's difficult to see the details required. If this were to be used as a full size imprint it would look pretty rough and the end customer would be less than happy about it.