While your intentions were no doubt good the results are somewhat tastless. I'm not exactly sure that an image of a the shuttle engulfed in flames is a fitting "tribute". What you did is more a sensationalization of the accident than a tribute to the crew and mission. Your image should have contained a photo of the INTACT shuttle. Think of it this way: Would the families of any of the seven crew members want to display your image in their homes? Doubtfull as it is a reminder of the disaster. A tribute should contain a reminder of better times.