With pictures taken through store windows some of the compositional work has already been done. To avoid refections hold the camera flush with the window or use a lens skirt
Pictures shown here: 1. Graceful front-window neon dancer promoting shoe store 2. Vertical panorama picture using three photos (camera slid up a foot or so on window for each successive picture; the photos were stitched together with Photoshop) 3. Old US Army phone 4. Life-sized cardboard cutouts of "space invaders" 5. Skeleton promoting a store