This piece is Big Gun by Steve Locatelli in Antwerp, Belgium. Although I didn't take this photo I can highly recommend Belgium for its street art and graf scenes!
One of my top five Odeith pieces in Lisbon. What you can't see is the large shanty town just to the right and the new apartments across the road to the left. Damaia is a strange neighbourhood with both poor and middle-class parts, lots of abandoned factories and a graffed-up crack den where I barked back at two massive dogs. It beats getting bitten and needing rabies shots.