Duane Hanson's hyperreal sculptures, $90k Instagram photos and the winners of the Deutsche Börse – the week in art

Hanson’s overweight Americans descend on the Serpentine, a South African estate bags a top photography prize, and the Suicide Girls battle Richard Prince for ownership of their Instagram photos – all in your weekly dispatch

Agnes Martin
One of the greats, an abstract artist of minimalist rigour and ethereal craft whose vision is as pure as prairie rain.
• Tate Modern, London, 3 June until 11 October.

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