Guaté Mao is a very productive artist. Every time he comes to Toulouse, Guaté Mao paints portraits. Some of them in the downtown, only stay some days. So go there to see if this one still there. 
More information: https://www.facebook.com/GuateMao/

This artwork is visible on the street outside the residence , on a public box (electrical or post office ?) near the portal door.