Finished sanding. I added one more sheet of foam at the bottom of the star using ordinary PVA wood glue. You might notice the proportions on the actual sculpture are now not consistent with those on the model. The reason for this is that the sculpture will be lowered about 70-100 mm into the ground. Resting on a layer of gravel and surrounded by soil covered with grass.
After sanding I added a layer of filler. It will probably take a couple of days for it to dry. After sanding I will add more filler until I get a smooth surface.