smoke Rendering out is blurred I am not convenient to express my settings，So have attached my file

I want to make the smoke more clear，Like an example of a photo

My file:https://drive.google.com/open?id=0B9AIC7MxieHpdXN1QTdkbTZPZUU
On the ones with all the mushroom clouds, it looks like you need more resolution in your smoke domain. This will allow it to use a lot more detail.

(Also, this won't change the look, but to make it calculate faster, you can enable Smoke Adaptive Domain in the domain settings.)