Alex Lake: 'I used real gelato/ice-cream in all the shots I did with Paloma. The only thing that made the ice-cream vanish faster than the fact that it was constantly melting under the lights was Paloma constantly spooning it into her mouth between shots, to the point where she would insist that I come over and try it too, refusing to hold down the spoon in her outstretched arm until I did. Paloma's pose would naturally flick from a brooding femme fatale to near hysterical child-like excitement when a new ice-cream was placed in front of her. She is an amazing subject for a photographer and her character is never lost within the impossibly grand clothes she wears. Chaotic and loads of fun' Photograph: Alex Lake for the Observer
Antonio Olmos: 'Henson suggested we go outside to the roof terrace next to his bedroom window. We did some pics in the drizzly rain and I saw his window sill full of cigarette butts...'
For more from Antonio's shoot, click here Photograph: Antonio Olmos for the Observer
Make Up: Liz Pugh at Premier Hair.
Hair: Richard Scorer at Premier Hair.
Dog: Adele at Pet London Photograph: Jason Ell for the Observer
For more of Jason's images, click here Photograph: Jason Ell for the Observer
Katherine Rose: 'The little balcony from the hotel room I was supposed to shoot Olga in was a godsend. It makes such a difference to have a bit of colour rather than a beige room. Olga spent the shoot talking about how amazing her cabbage recipe is and that everyone should come to her house to try it' Photograph: Katherine Rose for the Observer
Chiara Goia: 'This was taken at place where I stopped right before finishing my first day of shooting. I just loved the spontaneity of the scene and the repetitive and delicate gestures of these people who work and live for – and give thanks to – the rice' Photograph: Chiara Goia for the Observer
Chiara Goia: 'It was a great story to do. Mostly because I have learned so much and met amazingly motivated people – motivated and enthusiastic about a completely natural way of cultivating.'
Watch an audio slideshow of Chiara's work here Photograph: Chiara Goia for the Observer
Antonio Olmos: 'When shooting with an iPhone, I mostly use the Hipstamatic app, which allows you to apply different films and lenses to get different filter effects. Unlike most photography Apps, you choose the filter beforehand and just shoot away, not stopping after every image taken to apply a filter' Photograph: Antonio Olmos for the Observer
Katherine Rose: 'Matthew was really fun to work with. I love that his expression seems to suggest that he has no idea what his hair is doing. He was really grateful for the shoot, which is so rewarding from a photographer's point of view. People are often too self conscious to enjoy seeing the outcome of a shoot' Photograph: Katherine Rose for the Observer
Gary Calton: 'She said to me that it was "nice to have someone different to talk to". Born in 1920, Eileen has witnessed a century the like of which will probably never be seen again. It was good to talk and to listen to her stories.'
Read the piece on the making of the documentary in this Sunday's Observer New Review Photograph: Gary Calton for the Observer
Gary Calton: 'Every picture tells a story. Sam's story is written all over this image. Clothes to keep warm; medicine for ill health; curtains closed to keep in the heat; 'Che' card; Communist monument; image of Ho Chi Minh and, in pride of place, an image of him being dragged away from a poll tax demonstration during Margaret Thatcher's visit to Liverpool. "They dragged us off in a black maria and locked us up for four hours" he said with pride.'
Read the piece on the making of the documentary in this Sunday's Observer New Review Photograph: Gary Calton for the Observer
Daldry was photographed at the Dominion Theatre, London, for the interview Photograph: Suki Dhanda for the Observer
Julian Broad: 'Casey was a gangly hurricane – we were all smitten. Wonderful energy and fast – keeps you on your toes … I like that. Diamond mouth was her plan – she has lots of plans ... Such fun to work with. I'm sure we will work together again soon.'
See more of Julian's photographs and read an interview with Casey in this Sunday's Observer Magazine. For more of Julian's images click here Photograph: Julian Broad for the Observer
For more of Heather's shoot, see this Sunday's Observer Magazine Photograph: Heather Favell for the Observer
Katherine Rose: 'I've never had such a direct experience of how forgiveness and opportunity can transform someone's life. Going to Volterra to photograph such a character was truly enlightening' Photograph: Katherine Rose for the Observer
Gary Calton: 'If I take an image with a camera phone, I am taking it for a reason. I spent three hours sitting in on the interview with the gang members. All had been to prison multiple times. In the space of 40 minutes I had taken a group image of the gang and was sat in the bedroom of a 21-year-old gang member listening to him rap with his friend. I took portraits with my camera phone. It was unobtrusive and I had the ability to email the image to them immediately. In short, it broke down barriers. It made them feel at ease' Photograph: Gary Calton for the Observer