This was one of my first attempts with Photoshop.  Drawn in about 2002 With CS2.  I took a picture of a cat, cut it out, and drew the door and mouse.  I don't think I saved those original photos or paths so the psd file is flat.  There is also a mask to get the oval shape.  While I would usually export a photo to a jpg the cat was gray anyway so I just used png.