Compositing an image. pt 2

To Create my image by adding an object from another image, I cut out the car using the magic wand tool and the add/subtract from selection options. I resized the car correctly and created a copy of the layer. I then added a motion blur to the layer and erased some of the parts that werent neccesary. I then got a picture of a dust trail and cut it out using the magic wand tool. Then i used the eraser with about 35/40% transparency to make the dust look realistic.