You can see from the small spherical artifact that the light is in the upper-right of the picture. So shadows on the upper-right mean that area is indented. W

You can see from the small spherical artifact that the light is in the upper-right of the picture. So shadows on the upper-right mean that area is indented. We can see such shadows on the leg of the sword fighter and on the shield. So both those areas are indented.