The painting is an expressive and vibrant work rendered in oil on canvas. The composition centres around a few simple objects, yet the use of colour and texture gives it a dynamic and compelling quality.

At the heart of the still life is a jar of strawberry jam, prominently positioned and labelled, which immediately draws the viewer's attention. The jar is accompanied by a dark bowl containing what appears to be fruit, likely plums, adding a contrasting element in both form and colour. Nearby, there is a small cluster of white flowers, which bring a touch of delicacy and lightness to the composition.

The background and surface on which these objects rest are painted in rich, deep red tones, creating a bold and dramatic backdrop. This vivid red is tempered by areas of blue and green, providing a sense of depth and complexity. The interplay of these colours suggests a sense of movement and energy, despite the still nature of the scene.

Selby's brushwork is loose and textured, contributing to an impressionistic feel. The objects seem to almost merge with the background, blurring the boundaries between them and the surrounding space. This technique highlights the artist's focus on the interplay of light, colour, and texture rather than precise detail.

Overall, "Still Life with Jam Jar" is a striking example of Selby's ability to infuse everyday objects with a sense of vitality and artistic significance, using bold colour choices and expressive brushstrokes to elevate the simplicity of the still life genre.