nope, it's not like that. i've seen lots of sculpt that
look like a real thing unpainted, because imagination builds it up to a real thing. it's easiest to make something monochrome to look like something, because brain cheats itself.
https://www.google.ru/search?q=bust...pvMAhVkJ5oKHb3BCFgQ_AUIBygB&biw=1920&bih=1104
if any of them were painted, they wouldn't look so nice anymore.
(search word is "bust", and i meant "white sculpture" and not "****s", as search result gives both

)
but yep may be your Reese turned out too dark and weathered. what i know is that painted sculpts always get "pffff it was better unpainted". check
this thread for example. there is a war going there over Kurt Russel headsculpt (while i don't know what they are even talking about, because he is as generic as somebody can be and i wouldn't recognize him EVER even if i saw him every day)
never saw Reese thread as there is no figure of him except for MMS02 (01?)