I can't load this picture, but if you shot it with the same testors enamel you were hand painting with, you can absolutely wet sand it smooth, hopefully you have enough coats to get it flat then buff it back up.
If you are seeing bumps in the paint, its either not thin enough, your spray tip is too small, psi too low or spray distance is too far or any combination of the above.
What exactly are you spraying and what are you spraying it with?
I'm happy to help, just have to know what you are working with.