I agree, it is supposed to be a custom (I think) Brad Pitt with long wavy blond hair, so Achilles from Troy. Some of the eBay listings actually label it that way, if memory serves. Pangaea did a "Greek General" action figure of Brad Pitt as Achilles, with a fine but slightly soft head sculpt featuring sculpted hair, mounted on an ACI body. This seems to be a custom intended as a replacement for that head. The custom sculpt reminds me of some of the later (Inglorious Basterds?) Brad Pitt sculpts, with the new hair attached. I am not sure it works perfectly overall or even in the two pieces matching, but it is a sort of improvement.
Honestly, I prefer the head sculpts that are done well in a generic way but are only vaguely reminiscent of the famous person they're modelled upon. Sometimes, it spoils a figure or diorama if the first thing someone sees is 'oh that's so and so'.
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