Le Gras focused on the physical presence of his subjects. In works like Tijgerkop and Kop van een orang-oetang, he used tight framing to create a sense of proximity. He avoided the romanticised views of the East common in that era. Instead, he painted with a naturalist perspective. His palette often used muted earth tones to represent the dust and heat of the desert. He balanced technical accuracy with a direct style.

His animal portraits work well in contemporary interiors because of their neutral colours and clear compositions. Pieces like Kamelen or Aquarium offer a calm, observational quality. They provide a window into a specific historical moment of natural history study. These prints suit spaces that value realism and a connection to the natural world. Collectors appreciate the honesty in his depictions of wildlife and North African scenes.