One of the pleasures of viewing day clouds is observing their apparent structure--they are made of tiny bits of water or ice, after all--and their flimsy whispery-ness. As you watch these images, note especially the "cloud holes." They give depth and dimensionality to the images if seen imaginatively.
Cloud types depend on altitude:
0 miles - Stratus clouds (fog)
1 mile - Cumulus, Stratocumulus, Nimbostratus (rain).
From 1 mile at base to 8 miles at top: Cumulonimbus (thunderhead).
3 miles - Altostratus (haze). 4 miles - Altocumulus.
5 miles - Cirrostratus. 6 miles - Cirrocumulus. 7 miles - Cirrus.