Tips on realistic photo composite

[Happy]

Hey!

I am trying to make some realistic photo composites, and wondered if you talented forum users could review it and come with some feedback. Sheeps.jpg is a mother sheep and her lamb standing in front of a sign advertising for cheap sheep meat, whereas toycar.jpg is a toycar replacing a real car.

What I have done to this point is basically color adjusment, some curves, making some legs for the sheeps by copying from the other legs, some reflection on the car, some shadows and stuff. Yeah. Have a look, and please let me know what I can improve Feedback will be greatly appreciated!

 

[iDad]

I would suggest using the dodge tool on the side of the blue car to simulate the lighting on the car behind it the shadow reflection of the street should be a brighter
Here's a quick 42nd example... the selection process could pick much better