How do I use a reference image in Midjourney?

To use a reference image in Midjourney, an AI tool for creating visual art and imagery, you start by selecting or uploading the image you desire as a reference. Once the image is prepared, incorporate it into your Midjourney project by using it to guide the style, colors, composition, or details of the artwork you're planning to create. You interact with Midjourney through commands, so you would reference your image typically within a prompt sequence that tells Midjourney what kind of output you're expecting — essentially direction on how to interpret the inspiration from your chosen image. Be sure to follow any specific formatting or command guidelines provided by Midjourney for including reference images to ensure the best possible results in your creative project.