My daughter thinks it's jenni falconer but I haven't found the picture either, but then I haven't found the picture for several others that I'm fairly sure are right. I haven't got most of the ones you're stuck on but 23 is american civil rights leader. I think 68 is jago cooper but can't find the picture. I must say I'd never heard of him, but came across a picture of him and it looked right. Could you give me a clue for 19, please? I know him from somewhere and can't think where.