I have seen a particular fume vortex that I've been wanting to sit down and figure out for a few years, but never got there. Any help achieving this shape of vortex appreciated. Mine have come out messy, bubbly, and over struck.

Thanks in advance. I'll post pics of my future attempts. Working away from torch this week so I have some time to sit and think about it more.

This is a piece buy the absolutely amazing artist Alex Craig. This is the best one I've seen so far, so I am using this for my example picture.

I'm not asking anyone to divulge his secrets or anything so if this cant be answered in good morals then that's totally fine with me. I dont want to step on anyone's toes or techs. This is something I've seen a lot of so I dont think it would be a problem.