I saw the original of this artwork from the manga. You did a good job vectoring it. I love the way you created the texture for the basketball. It's awesome.
The black text in the background is not that necessary. It takes away from the dynamic of the main text that you have. You could either kill them or arrange them like you did with the main ones. Or you could use them as the motion line the same as in the original to create momentum/movement.