In Joseph Leeson, later 2nd Earl of Milltown, the subject is depicted in a formal pose, dressed in elegant attire typical of the 18th century. The color palette features rich reds and golds, enhancing the aristocratic feel of the portrait. Leeson's expression is confident, suggesting his status and importance.

The background is a subtle blend of colors that does not distract from the figure, focusing the viewer's attention on him. The painting is executed in oil on canvas, a common medium for portraits in the Rococo style. Batoni's technique includes smooth brushwork and a careful attention to detail, particularly in the textures of the fabric and the play of light on the subject's face. The dimensions are approximately 100 x 125 cm, making it a sizable work that commands presence.

The composition is balanced, with Leeson positioned centrally, drawing the viewer's eye. Pompeo Batoni was a prominent Italian painter known for his portraits of the European elite during the 18th century. This particular work reflects the Rococo style, characterized by its ornate details and vibrant colors. An interesting fact about this painting is that it was commissioned to celebrate Leeson’s elevation to the peerage, marking a significant moment in his life.

Batoni's portraits were highly sought after, and this work exemplifies his ability to convey both personality and status.