The Crescent Moon is a beautiful sight.
Often we can see the rest of the Moon as well as the white crescent. This is always for a few days just before or just after the New Moon and is known as Earthshine.
If you were standing on the Moon at the time of a new or cresent Moon you would see a Full Earth. Just as the Full Moon illuminates our landscape here on Earth at the time of Full Moon, the Full Earth illuminates the landscape of the Moon and this is what we're seeing when we see the Moon's surface at the crescent Moon.
Light from the Sun shines onto the Earth then