Today I worked on the Vortices piece and slowly I am achieving what I was looking for. Had to redo some parts, as the colour combinations of background and thread didn´t work, but now I think most areas are OK.
Taking a picture of it is very difficult, so I tried a scan. The complete piece still looks not too good (on the scan), but I think the details now give a good idea of what it looks in reality.
I don´t use a stabilizer cause I was trying to make the vortices become a bit 3D. In some areas it worked well, in others it still is too flat. I think I´ll try to poke and manipulate these areas later and maybe stuff the back with some batting.