This is the result. I think i can be better in the next days.
In order (its my first day in ae, don't blame me)
- Duplicate the layer with keylight
- Precompose the duplicate, open it, add more softness to the keylight. Add effect distorsion, turbolence.
- Duplicate another time, add effect, chanel, invert
- esc from the precompose and use this as a mask for a new solid, with fractal noise and tritone