It would probably be a bit more helpful to most folks if you have a visual example of the step-by-step process in how to do this, since this is meant to be a tutorial for those that don't know how to start things off. Even supplying links to other tutorials you'd recommend for turning images into brushes would be most helpful to people who don't have the slightest idea how to do this and would love to learn how. (ex. something like
this, though the video is mostly for GIMP users) Other than that, it's a pretty good tip for those who already have some knowledge on what to do.