Graphics are a matter of personal taste, so a mod that looks prettier to me may not look pretty to you.
Before you even download any mods you should start with tweaking the game itself. There are plenty of tweaks that make a significant visual difference. After that you can try out various mods which alter the visuals of the game, improving the landscapes, adding/modifying character customizations and find a combination which looks best to your eyes.
It's a great guide, and also outlines where to download all manners of mods.
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