"I really admire Mr. Zeng's attention to detail. Whether it's plants or animals, he uses different techniques to highlight the authenticity of what he paints," said gallerygoer Qi Jiaru.

The show has also attracted quite a few children, who come to learn more about the species co-existing with human beings.

"I will be greatly encouraged if the drawings can bring the visitors a breath of nature," Zeng said.

Two years ago, the dedicated artist was diagnosed with lung cancer. But he says he won't put down his brushes.

"I hope I will be blessed with five more years, so that I can accomplish my long-cherished wishes," said Zeng, explaining that his next plan is to paint something about ecology, which is about the relationship between different species and the environment.

Zeng said he doesn't take any drugs for cancer, because he believes they make his hands tremble. He says creating more works with both scientific and artistic value is what really matters to him.