Very nice ducklings Alaskan, but they don't stay that size for long LOL ,is the box in your coop a bed or nestbox?. About the red on the mother ducks face, I'm not any duck expert but it may be a sign that it's not laying as with chickens just before they lay and when they are not laying their comb is pale and gets redder when they start laying, so as Muscovies are only seasonal layers it may be because she is not laying.