You already know your faults with the quality

Just check that all base images are a minimum of 1,600px wide, and donors usually over 2,000px wide - then you shouldn't have any quality issues. Also make sure that you save with quality "12" in photoshop
Other than that a nice chop - the wheels and backdrop fit well and look cool - the bg change is actually very nice - it matches the reflections already on the paint.
Only one mistake - the rear lights are now green/blue and not red
Keep it up
