Even Galactus fit this bill originally, with his pre-cosmic form, Galen, sporting an odd haircut but otherwise looking like he could stroll down Park Avenue without turning heads. (Hey, I didn’t say my take on the character wasn’t a retcon, right alongside Zenn-La and Shalla Bal.)

Since we’ve seen that the Heralds of Galactus maintain their familiar forms even when cut off from his influence—the Surfer abandoned on Earth, for instance—we would be reasonably safe in assuming a WYSIWYG stance. When we look at the heralds, we see them as they are. Cosmically powered they may be, but not at the same level as their master.