This is a work of art made by Banksy. Banksy has used stencil for his painting and the title is: Clacton-on-sea. 
On this painting, we can see a line at the left pigeons who take up banners and at their right there is a swallow . On the banners we can see some messages like “migrants not welcome” or “go back to Africa”. At the top, on the right there is a sewer outlet. The painting is dark , there is only one colour

Nafisatou