AndreaMosaic is an effective tool that helps you create a mosaic image made up of a collection of photographs. Using the program is simple, but it isn't always easy to get the results you want. Just select the image collection that you want to use to generate the mosaic, and the photo that you want the mosaic to emulate.
AndreaMosaic allows you to configure options like the size of the mosaic, the number of images per row, the width of the border, and how many images should separate two copies of the same image.
Keep in mind that the smaller the mosaic components are, the more the final result will look like the original photo. You should play with the adjustments until you achieve a mosaic that looks almost identical to the photo you used as a source.