His artistic approach combined the precision of genre painting with the atmospheric qualities of the Hague School. In works such as his coastal scenes featuring Teun the hunter, Sierich explored the relationship between the figure and the environment. He used a muted palette to capture the grey skies and shifting light of the North Sea dunes. His ability to balance human drama with the physical reality of the Dutch weather makes his work feel grounded and authentic. He avoided the sentimentality common in Victorian art, preferring a more direct observation of life.

Modern collectors value Sierich for his ability to evoke a specific sense of place and history without relying on grand gestures. His small-scale cityscapes and stormy scenes offer a quiet intensity that suits contemporary interiors. The narrative elements in his work provide a window into 19th-century Dutch culture, making these prints a conversation piece for those interested in European history. His focus on the everyday, from a hunter with his dog to a quiet street corner, remains relatable and visually stable.