give me an idea of your position when taking the picture? What direction were you looking to (north/south/east/west)?
This shot was taken from village Casau above Viella, to south - east, i find another photo of peaks in http://www.panoramio.com/photo/10036344
You were quite right when thinking about the Tuca de Betrén, for it's placed in that area. But it can't be seen in this picture (it would be left of that rocky pyramid in the background). The rocky pyramid to the left is the Mall de Rius (2631 meters) and the wide rocky peak to its right is the Tuc de Sarrahèra (2645 meters)