It looks okay as is but for a game that came out in 2000 you think I could sharpen it a little. Am I missing something?
Well, I'm not sure what Interplay was trying to do with their 3D modeling of the terrain, but it kinda looks like Myth.
That being said, GoG doesn't usually tweak the games at all. They just make sure they're playable on modern systems. They don't have access to the source code and they don't have the resources to rewrite games.
Every once in awhile they can unlock a higher resolution or do something minor like that, but it shouldn't be expected.