In reply to marko:
I haven't done any of the below and my Picos skiing experience is quite limited, so the below is only based on research, not personal experience:
You have three options:
1.
http://es.wikiloc.com/wikiloc/view.do?id=452028 (only the last part of this track, check in the elevation profile where the last descent begins around 10km mark) is a super easy descent following a 4x4 track that takes you to Espinama village. This means you'd need two cars, or else you need to go back to Fuente De on foot to get back to the car. The descent is long and easy angled, biggest problem is that you need _a_lot_of_snow to be able to Espinama, as the pueblo is quite low and doesn't get that much snow. (by the way, I recommend a small rural hotel there that's called Vicente Campo - they have good accomodation and good restaurant. There's also a good hostel Nevandi just on the other side of the road - worse food but nice rooms)
2. If you're up for it, and the conditions allow, you can try descending via Canal Jenduda:
http://personales.gestion.unican.es/garciaj/jenduda.html
I haven't done it, so I only base on what I heard. This descent can be quite committing so make sure you do it only if the group has the skills to do it safely.
3. I am guessing it would also be possible to get down the Tornos de Liordes, however I'd expect it to be really avalanche-prone and also quite committing, especially in the upper middle parts...
Hope this helps you a bit
RS