This model has been created with smoothie-3d.com which is a free online modeling tool. Making of: http://youtu.be/g2mNvgtJ_gQ
Made from one photo:https://upload.wikimedia.org/wikipedia/commons/6/61/Indian_Rhino_001.jpg
Model on smoothie-3d.com: http://smoothie-3d.com/?p=nebulousflynn@13