She is a daughter of a primary school teacher, her mother, and county council director of education, her father. Saville is also one of four sibling. Saville became fascinated with painting at the age of eight, her mother gave her broom closet that she could use as studio. Even though, was a big step for her in becoming a painter another influence for her to become a painter would have to be her uncle, Paul Saville, and art historian and painter himself. Saville talked about how he was the one convinced her that she could be an artist. In an interview she said, "When I was about 11, he gave me a section of hedge, and told me to observe it for a whole year. So I did, and I learnt such a lot about how nature shifts, and the necessity to really look.” He took her Holland to look at Rembrandt and also to Venice to look at the Titian when she was a teenager. She said that as she stood in front of Titian’s huge painting Assumption of the Virgin that is in the Frari church, she thought ‘One day I’ll do a painting as big as that’. She tells that her uncle taught her that great painting were not just there to be looked at in an admiring way. With his help it made Seville realize that she wanted to be an artist and never questioned her ambition, she said:
“I never thought: I 'm a girl, I can 't do this. It was only when I got to art school that I realised that the great artists of the past were not women. I had a sort of epiphany in the library: where are all the women? Only then, as the truth dawned, did I start to feel pissed