"My grandfather was a Romany boxer, but sometimes fought bare-knuckle, which his own father did for a living. I loved my grandfather, although I was aware that other people were frightened of him. He always treated me with a great deal of love. It’s left me between two worlds – love and violence. It was definitely an emotive painting: I felt he was looking at me. In some ways he wouldn’t have been very happy about it, because he was a very private man. What I study more than anything else is the human shadow. The need to paint something until you’ve shown as much of it as you can."