Réponse :
Bonjour, ma réponse ci-dessous concerne l'oeuvre n°4.
The artwork shown in picture 4 is a graffiti that have been created by the artist Banksy and which appeared on a wall in London (United Kingdom). The graffiti in blood red paint features a statement "If graffiti changed anything – it would be illegal" and a rat (which is known to be the signature of the artist).
J'espère que cela t'aura aider, n'hésites pas si tu as des questions.