Not bad! What are you shooting on? Also, I assume you're using the stock flash from the camera?

Tip for the rolling shots, if you want to get a nice background blur, and wheel spin, turn the camera to shutter priority, and drop the shutter speed to 1/60th and adjust as needed. (Meaning make it quicker 1/80th or more if you want less blur, or slower 1/30th if you want more blur)