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This guy travels around the world meeting beekeepers and taking amazing photos.
Check frames. Honey bees in full size hives should cover more than five frames, if less then dwindling is indicated. Nosema is a dwindling disease which shortens the life span of adult bees, so
overwintering bees start dying before they are replaced in the spring. A simple microscopy
check can confirm this. Check the hive entrance where you will see dead bees on the
ground - if it is more than about 100 investigate. If the bees are flying then look to see if
returning workers are carrying pollen, indicating that all is well.