Compare Joe 2:4. The likeness of a locust to a horse, especially to a horse equipped with armor, is so striking that the insect is named in German Heupferd hay-horse, and in Italian calvaletta little horse.
Crowns
Not actual crowns, but as crowns. Milligan remarks that any yellow brilliancy about the head of the insect is a sufficient foundation for the figure.
As the faces of men
There is a distant resemblance to the human countenance in the face of the locust. Men (ἀνθρώπων) is to be taken not as distinguishing sex, but in the generic sense: human faces.