No one knows exactly how cherubim are supposed to look like. Historically cherubim were portrayed as naked little children with halos and wings, frequently found on Valentine's Day cards. However modern interpretation has rendered the cherubim as winged sphinx-like creatures.

The Bible made a special note about the two great cherubim in the Most Holy Place concerning their posture (2 Chronicles 3:13); they stood on their feet facing the Holy Place, as if they were guarding the place. In contrast, the two cherubim of the Mercy Seat were facing each other towards the Mercy Seat - not guarding, but serving God. Instead of standing up, they would be set in a more humble posture, probably lying down.   More about cherubim...