In Portrait of Bryan Cooke of Owston, the subject is depicted in a three-quarter pose, showcasing his refined attire and confident demeanor. The color palette is rich, with deep blues and warm browns that highlight the subject's features. The background is softly blurred, drawing attention to Cooke's face and the intricate details of his clothing.

The overall composition conveys a sense of dignity and sophistication. This painting is executed in oil on canvas, a common medium for portraits during the 18th century. The dimensions are approximately 76 x 63 cm, making it a sizable work that allows for detailed representation. Romney's brushwork is smooth, with a focus on capturing the texture of fabric and the play of light on the subject's skin.

The use of chiaroscuro enhances the three-dimensionality of Cooke's figure. George Romney was a prominent British portrait painter known for his ability to capture the character of his sitters. This work, created around c. 1775, reflects the Romantic style that emphasizes individuality and emotion.

An interesting fact about this painting is that it was commissioned by Cooke himself, indicating the subject's desire to be immortalized in art. Romney's portraits were highly sought after, making him one of the leading artists of his time.