analyze the visual composition of this SVG image, disregarding all textual elements and watermark overlays. Provide a detailed, descriptive list of only the geometric shapes (vector paths) present, including their type (e.g., rounded-corner rectangle, semicircle), precise colors (using hex codes if possible), and their relative position to one another (e.g., top, middle, bottom).

The image shows a black and white silhouette of a megaphone with the word "shutterstock" written in the center. The background is white and there is a watermark at the bottom of the image.