In January 2011, one of his work - "Portrait of Kurt Cobain (Retrato de Kurt Cobain)" - reached the second highest value in the sale of contemporary art at the Austrian auction house, Dorotheum. In September 2012, another portrait of Kurt Cobain by Martinez was sold at Christie's in London. In January 2013, in Warsaw one of his works - "Diana" - reached the highest value on the auction at Forbes Millionaires Club.