Go play some korean MMO if you want beautiful characters with baby-smooth faces. ;)
Valheim's charm lies in it's low-poly, low-res graphics yet it can still create amazing vistas and screenshots even without any reshades or mods (I can wholeheartedly say that Valheim looks much, much better than Skyrim (even SE), which was supposed to be AAA game made by an experienced studio). But feel free to play with graphical mods if you prefer (it's completely fine to dislike some aspects of any game but still enjoy it overall).