In Frog With Marsh Marigold, the painting features a vibrant green frog nestled among bright yellow marsh marigolds. The colors are rich and lively, with the frog's green contrasting beautifully against the flowers. The setting appears to be a lush marsh environment, suggesting a natural habitat.

The attention to detail captures the textures of both the frog and the flowers. The painting is executed in oil on canvas, showcasing Järnefelt's skill in rendering natural forms. The dimensions are approximately 30 x 40 cm, making it a relatively small yet intimate work. The brushwork is precise, allowing for a realistic portrayal of the subjects.

Viewers can appreciate the careful blending of colors that brings the scene to life. Eero Järnefelt was a Finnish painter known for his realistic depictions of nature and everyday life. This work reflects his interest in the natural world, particularly in capturing the beauty of flora and fauna. An interesting fact about this painting is that it exemplifies Järnefelt's transition towards more detailed and intimate studies of nature, which became a hallmark of his later work.

His dedication to realism set him apart in the Finnish art scene of the late 19th century.