Zach zombek

This is probably an extreme noob question, but I am trying to create billowy smoke for a rocket launch sequence. I imagine it to be simple for an experienced Houdini visual fx artist, but I am very very new to Houdini and am having trouble with a couple of things. My renders come out super blocky and low-detail for some reason. I'm sort of in a desperate situation where I just need some detailed billowy smoke flowing out one source, as seen in a standard rocket/shuttle launch. Can anyone assist me with this? Any help/wisdom/knowledge is much appreciated, and I apologize for such a beginner question. Attached is the project file of the volcano preset I tried to transform into the billowy smoke.