This volcano and its plume are fully procedural. The clouds are created with the new QuadSpinner HELIOS technology I am working on. This was one of the comprehensive demos for showcasing the strength and speed of the software. This is image is a single frame from an animation where the volcano erupts and the clouds animate. The entire animation is available on QuadSpinner.com/Helios.
Everything was created inside e-on software's Vue 10 Infinite, then taken to After Effects for minor postwork and color correction.