“Photography is a refuge for failed painters,” declared the French poet, Charles Baudelaire around 1862. Yet photography took over a century to become a genuine family member of the art world. The British Library was slow to capitalise on the visitor value and historical significance of the vast photo-archive that it accumulated over the birth-period of this new artform. But its spectacular debut exhibition has burst open the vaults containing over 300,000 images, and now presents a magnificent production leading visitors on a journey back through time as the new art form was gradually building momentum.

Graffiti is the only form of artistic self-expression that can get you both arrested and exhibited. Its most celebrated exponent, Banksy, is the subject of tabloid news speculation. The faces and names of most graffiti artists are even more of a closed book. Until Crack & Shine, that is. Gaining exclusive access to these creative renegades as they work, the photographer Will Robson-Scott shines a light into occluded corners of nighttime London where graffiti art finds its stealthy way onto brick walls and tube carriages.

Does a winning photograph jump out at you? Sure, we can talk earnestly of composition, an interesting subject, a telling juxtaposition, or the abstract interplay of colour, texture and light. But perhaps more than any other visual art form, what strikes us most about a photographic image remains somehow more elusive. And the hand of the artist who presses the shutter, rather than wields the brush, is not so easily perceived.

Jillian Edelstein, the distinguished photographer, is joining theartsdesk. She grew up in Cape Town and in 1985 moved to London, where within a year she had won the Kodak UK Young Photographer of the Year award. It was to be the first of many such accolades. She has since established a reputation as one of the leading portrait photographers of the age, her work appearing widely in this country but also for American publications including The New Yorker, Vanity Fair, Vogue and Interview.

Acclaimed photographer Jillian Edelstein's series of Portraits include images of significant figures from the world of arts, fashion and the demi-monde, but also politics: her portrait of Nelson Mandela, taken in Cape Town in 1997. There is also a delightful photograph of three South African boys mucking about by the water.

Charlotte MacMillan photographed the Royal Ballet's Mayerling, with choreography by Kenneth MacMillan, music by Franz Liszt, and designs by Nicholas Georgiadis, which opens at the Royal Opera House on Wednesday. The cast is headed by Edward Watson as the death-obsessed Crown Prince Rudolf of the Hapsburg imperial dynasty and Mara Galeazzi as his partner in death, the court groupie Mary Vetsera.

I don't think I've ever seen quite so high a patron:picture ratio as at the Cindy Sherman opening at Sprüth Magers on Grafton Street last night. The gallery verily overflowed with an unaccustomed mixture of Mayfair and Shoreditch, spilling out onto the street where neon t-shirts rubbed shoulders with tailored suits, all to see three pictures.