1. Medium: Watercolor on paper

2. Shapes and objects: A small Christmas tree is the central focus of the painting. The tree is decorated with red ornaments and topped with a blue star. It's placed on a blue plate or stand. The tree is situated on what appears to be a yellow surface, possibly a table or floor.

3. Colours: The tree is painted in various shades of green. Red dots represent ornaments on the tree. A vibrant blue is used for the star on top and the base or plate. The foreground is a warm yellow. The background is left as the white of the paper.

4. Narrative: This painting captures the essence of holiday cheer in a simple, almost minimalist style. The small size of the tree suggests perhaps a modest celebration or a child's tree. The bright colors - particularly the red ornaments and blue star - convey a festive mood. The yellow base gives a warm, inviting feeling to the scene. Overall, the painting evokes feelings of warmth, joy, and the simple pleasures of holiday decorations.

5. Original Artist: While this is an original work by Mehrdad Fahimi, the style and subject matter bring to mind the work of American artist Wayne Thiebaud, known for his colorful, stylized depictions of everyday objects. Thiebaud often used bold colors and simplified forms in his paintings.

However, the loose, fluid style of the watercolor also reminds one of the more abstract Christmas tree paintings by Fairfield Porter, an American painter known for his intimate, domestic scenes.

A comparable work might be Thiebaud's various cake and dessert paintings, though with a holiday theme. Thiebaud's works can be found in major museums across the United States, including the Whitney Museum of American Art in New York.

While Fahimi's painting is clearly his own, it seems to blend influences from both Pop Art and more traditional watercolor techniques, creating a charming, contemporary take on a classic holiday subject. The painting continues the tradition of finding beauty and meaning in simple, everyday objects, especially those associated with celebrations and traditions.