Great ideas man! The things im about to say is just for your own good. Maybe you want to pick em up and use my tips to improve?
Lets start with the good things. I really like how you have combined parts used from the donors onto your chop. They really seem to fit, youve done a great job rigth there.
But some things are bothering me. First of all, the wheels looks tooooo big for the car, as it looks like they are hitting the arches. Try resize them to make them fit more.
Also, the shadow youve made is rather off. (By off, i mean that it doesnt fit)
At the front wheel, it seems that the car have more ground clearance than the rear. Also, what i do to make the shadows look better is to feather the selection i make before filling it with black (maybe 2-3px)
I can see youve made a 2-door conversion. Firstly, it seldom look good on a SUV. But if you want to do such a conversion - you should bring the B-Post further to the back i think.
The last thing that is worth mentioning is the background swap. If youre not changing the reflections of the car when changing the background - you should find a background as similar as the original one to prevent that the car stands out, or doenst fit in the new background. What i also want you to consider is the lightning on the atmosphere.
I hope you can bring these tips onto your next chop! I really see potential in you, otherwise i wouldnt care writing this to you!
Good luck mate!
- iCandi