Johann Heinrich Engelbert Neumann ( 1801 - 1879 ) was a German painter. Johann Heinrich Engelbert Neumann s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1110.79 USD for Shipping off Copenhagen in 2005 to 15958.3 USD for PORTRAIT OF ALEXANDRA PAVLOVA, GRAND DUCHESS OF RUSSIA (1783 -1801)AND ELENA PAVLOVNA, GRAND DUCHESS OF RUSSI