I guess it would depend on what the shoe material is, leather, plastic, or cloth. You could try one of those iron-on transfers where you print it out on an inkjet and iron on to the material. It may be tricky with the curves but cut up and match pieces to the shoe. Stuff the shoe with something firm like a bunch of socks and iron on. If you are artistic, you can project the image on and trace or else create a drawing to trace onto the shoe with graphite paper. You can then color in the image with markers or paint. Good luck.