what does its composition consist of?
An ornate imaginary classical temple is under attack from a destroying angel and a group of daemons.
The Destroying Angel and Daemons of Evil Interrupting the Orgies of the Vicious and Intemperate
The Destroying Angel" is a visionary work, depicting a wholly imaginary scene rather than a scene from history, literature or mythology. It measures 127.8 cm by 101.9 cm (50 in by 40 in), and depicts an ornate imaginary classical temple. The temple and its occupants are under attack from a destroying angel and a group of daemons, who are in the process of abducting its human occupants. 
what is 'the destroying angel and daemons of evil interrupting the orgies of the vicious and intemperate'? An oil painting on canvas.
wiki:18902713
The Destroying Angel and Daemons of Evil Interrupting the Orgies of the Vicious and Intemperate [SEP] Composition
Behind her, other women struggle helplessly with the daemons or are carried away unconscious, having fainted. In the centre of the foreground is a figure modelled on Caius Gabriel Cibber's "Raving Madness", which at the time was one of two monumental sculptures above the entrance to Bethlem Hospital ("Bedlam"), and a well-known London landmark and symbol of insanity. The chained figure is contorted in agony struggling to escape his bonds, while a daemon pulls on one end of the chain. Beside this lunatic is an unconscious or dead gambler, his winnings spread on the floor beside him. Behind the central images of the lunatic, daemon and gambler are a group of people who have only just realised what is happening.