We did Pico Mulleres from this route. We got the bus in from the parking at Hosp de Benasque as you can't drive up to La Besurta in summer.
From there, the mist came down and it rained on us until the first lake. After that the sun came out. Lots of snow still beyond the second lake.
We came down the same way.
Also, have done the circular route via Barrancs, returning via this valley to La Besurta.
Next I'd like to do the Ibon de Toro.. but R has already done it so its not at the top of the list.