As a really vague/generalized rule of thumb the shutter speed should be something like:
1 / focal length
So if you’re shooting at 200 mm you should use a shutter speed of 200 or faster to avoid camera shake.
In a photograph like this at a very slow shutter speed and handheld it’s almost impossible to hold it steady and avoid camera shake.
So if you need to shoot a slow shutter speed photograph of something like this use a tripod. That will make everything that isn’t moving nice and sharp and the things that are moving will have that nice motion effect.
That said you’ve done well here.
Keep practicing!
馃槈