> Any hints ?

In Thomas de Groot's recent posting in this NG (Kathy's World), he shows two
images of a cracked mud flat.
In the first he has evidently used two layers, one of which is missing.
With a statue you might try this approach, with one surface scaled down and
nested in another which is
broken up / partial / incomplete / subtracted from
to suggest wear and surface deterioration.
That way there will be some sort of variation in the otherwise perfect
silhouette.

In povray.newusers on Oct 25 2006 there was a thread entitled "simulating
cracks in surfaces using normals" which has useful practical information.

DLM

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