Use a clear source image, inspect hair and fine edges, and avoid judging the result only at full zoom. A transparent PNG can be placed over another design later, which makes the workflow useful for product cards, thumbnails, profile graphics, and presentations.
Know the limitation
A good result depends on the source image. Busy backgrounds, low contrast, reflections, glass, and fine details can make automatic segmentation harder. For important commercial or academic graphics, review the output before publishing.