For me - the slightly geeky, gawky look can be very attractive...
Examples (UK only): Moya Brady (Robbie Cryer in 'The Bill'), Tamsin Greig (Black Books, Green Wing), Blyth Duff (DS Jackie Reid in 'Taggart')
Large, aquiline noses
A gap in the front teeth
Cardinal Fang, of the 'Barbie dolls are ten a penny' class