You will have to add some motion blur to the new BG/trees since the rest of the images has this. The best way I think would be to extend your canvas out to the right so that the vanishing point can fit on the canvas. And then you will have go into radial blur > zoom. You will then have to make the centre of the zoom blur on the vanishing point and just try it a few times with different strengths until it looks correct.
If you don't understand I will make a quick picture for you, but will be in a bout 12 hours.
Looks good though!