Enlarge your favorite photo at a copy and print center to your desired size. Make sure the new size is proportional to the size of the original photograph to avoid distortion of the image.
Place the tracing paper over your enlarged photo and thoroughly trace the lines of the images.
Tape carbon transfer paper to the tracing paper with the carbon side facing outwards. Only place tape on the edges of the papers.
Tape the carbon paper/tracing paper to your poster board -- with the tracing paper facing up -- so the image does not shift while being transferred onto the poster board.
Trace over your traced image by pressing down firmly with the pencil so that your lines transfer onto to poster board.
Remove the carbon paper/tracing paper from the poster and check over the transferred image, darkening any lines that are not clear.
Cut pieces of magazine, construction paper and photos with colors that correspond to the colors in your original photo. Select darker shades of the color for areas that are shaded.
Shape the pieces to fit the outline of the images where you intend to glue them down. Cut the pieces into whatever size you desire.
Glue pieces down, spacing them to create your desired effect. Mark the area in the original photo as you complete them.
Dip a paintbrush in gesso and go over the entire poster. Let it dry.