How much detail is too much?

I think its most inportant if your gonna make a custome of some thing thats supose to look like some thing (ofc but keep reading thers more ) like a Big daddy ore a actor but if your just making a horable disfigured mutant from the deepest swaps of your mind then its up to you.

Take a look at Jessecuster's work and you have your answer.

Detail is king imho.

In my opinion, its all up to the creator! Everyone has a taste for something a little different, hence whyI am sure custom figure making is so popular! It also goes on what kind of look you are going for. For example, the clone troopers from star wars figures. You can get the Anniversary that look more real or the clone wars line that are more animated looking, yet both are of the same thing. So if you want a simple, yet impressionable figure, or a fully detailed that it looks no different from a real being, its all up to you!!!