Street art in BCN

As usual, I find myself documenting the graffiti here in Barcelona. We've seen some really interesting ones in the past two days. The first one of the woman with the yellow face is by an artist named C215 from Paris, who specializes in stencils - http://www.fatcap.com/article/c215-1.html. The stencil of the two girls is signed by Alice and the one of the butterfly is signed by Nina, but I can't find any info about the others.