[2] Among the three artists she brought from Patna to make realistic sketches of birds and animals of her private menagerie, Zainuddin was the foremost.

[2] In his paintings, modern critics appreciate the way a "bright, simple background offsets the keenly wrought details of plants and animals".

For his tinted drawings and sketches, he employed meticulous calligraphic strokes reminiscent of the works of Mughal Court artist Ustad Mansur.

Subsequently, Zainuddin's work was exhibited in 2019 at London's Wallace Collection, along with that of 17 other artists commissioned by the British East India Company.

The director of the Wallace Collection, Xavier Bray, told Smithsonian that in Zainuddin's paintings, "Everything is incredibly precise and beautifully observant.