Agents physical forms are a reflection of their minds, their mental history, their feelings about themselves and their own personal symbolism. Older agents are fairly stable in their identities, so their appearances are stable as well - but young Agents, young agents are something else entirely.

When they break out of their larval bodies, they are exhilerated by their new senses and emotions, and full of curiosity about the world and themselves, having no set identity or symbolism, everything is in constant flux as they make new discoveries and change their minds.

Photoshop