There are a few things you can do to fill in a silhouette in Photoshop. The first is to use the Pen tool to draw a line across the bottom of the image, then use the Polygonal tool to create a triangle around that line. Next, use the Rectangle tool to make a rectangle that is about twice as wide as the image itself and long enough to cover all of the image’s bottom. Finally, use the Ellipse tool to make an ellipse around the rectangle.
