Original GIMP piece: http://sta.sh/01ys9iqirh9t (too small for ArtStation)
After experimenting with the watery effects brush in Procreate, I decided to try and recreate an older piece of mine I'd made in GIMP years ago.
Procreate: Final compositing.
Autodesk Sketchbook. Radial gradient fill.
Autodesk Sketchbook. Simple two layer bit with some simple airbrushing and fills.
Zenbrush 2 (can't quite see it due to the transparent background)