Make a duplicate of the bottom blue shape and resize it as shown in the top illustration. Using the Shape Editor Tool (shown in the inset) angle the top of the shape a little bit as shown. (Select the shape first, then the Shape Editor Tool, and drag the control node). Change the fill color to deep red using the RGB percentages shown. Change the fill type to Circular and drag the center of the fill upwards as shown.
Make a duplicate of this new shape (Ctrl-D) and apply the sand bitmap fill, again by opening the Bitmap Gallery on the Infobar, selecting the new duplicate shape, then the sand fill, and clicking the Fill button,