General:
* Metamorphosis: This implies a significant transformation, but it can also be used for more subtle changes.
* Transformation: Similar to metamorphosis, but can be used for both big and small changes.
* Shift: This suggests a subtle change in appearance or form.
* Evolution: This implies gradual change over time.
Specific to appearance:
* Camouflage: This refers to altering appearance to blend in with the surroundings.
* Disguise: This means changing appearance to hide one's true identity.
* Masquerade: This implies assuming a false appearance for entertainment or deception.
* Makeover: This often refers to a change in appearance to improve it.
* Reshape: This implies a change in form or structure.
Other possibilities:
* Adaptation: This refers to changing in response to environmental factors.
* Modification: This implies a change made to something.
* Fluctuation: This describes something that changes frequently or unpredictably.
The best word to use will depend on the specific situation and the nature of the change.