Alter some Images

Look at the box robot pictures. See how they are holding hands?. I just want a background down behind them of two thrones and them standing on red carpets. I also want to add two small crones to there heads. This should be VERY simple if you know what your doing, your just placing them into stock photo. I need this done within the next two-three hours. Look at the EXAMPLE 2 to see how the crown should look.