If we go purely by the ToS I'd say it is okay as long as it doesn't allow you to cheat:
ZeniMax does not endorse, sponsor, guaranty or approve any Game Mods, including without limitation Game Mods available for download from a ZeniMax website.
Your experience with any particular Game Mod may vary from other users' experiences.
IF YOU ELECT TO INSTALL, DOWNLOAD OR USE ANY GAME MODS, YOU DO SO AT YOUR OWN RISK.
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Originally Posted by Gina Bruno
all ZeniMax games share the same TOS.
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But I have to say, removing the fog and changing the colors doesn't make it look better. My eyes bleed everytime I see someone post a screenshot like that and say how "good" it looks. But that's probably just my opinion.