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- To create car motion effect, apply Motion blur to the bottom car layer.
- You should get something like this, apply small Perspective transformation to it.
- Apply Screen Blending Mode and Opacity 75% to it.
- Erase front area of the blurred layer.
- Insert paint splash image.
- Make it black & white: Image > Adjustments > Black & White > Maximum White, set Red channel like on the screen shot.
- This is black and white paint splash.
- Apply Horizontal Flip transformation to it. Edit > Transformation > Flip Horizontal.
- Place Splash layer below car layer.
- Rotate splash like in the example below.
- Correct color balance for paint splash to make it similar car body color.
- Image > Adjustments > Selective color. Play with setting to get best result.