Having no experience of angels, I rely on the Talmud’s assertions that angels are made, variously, of fire, water, snow, and song; also upon Maimonides’ statement in the 12th century that when the text mentions “angels” it is referring to natural forces. The gray angels in the lower left are inspired by a pair found in the 14th century Sarajevo Haggadah, the one in the text box by an image from a 13th century German manuscript.
The script is taken from an amulet from the 7th or 8th century. This refers to the incantational quality of this part of the prayer. One who prefers to concentrate on the meaning of the words might decide that silence is preferable to this verbosity.