I just remade a map from a 22-year-old game (Unreal Tournament by Epic Games). It just a personal project for my portfolio which I hope to find a job as a 3D environment artist. I made everything from scratch completely only using screenshots or textures from the Unreal Tournament Editor as references. Is this okay? I just want to make sure there are no legal issues with this. I have seen many quixel videos on YouTube of them remaking environments from Counter-Strike, Warcraft, and Halo: Combat Evolved.
For my next project, I want to remake another really old game environment but make it more my own idea since the original idea is boring and bland. I just want to take inspiration this time and make it more my own and modern as if what would the game developers do today if they were remaking it.
I've seen many do fan art of characters, environments, and weapons, etc for their portfolio or personal hobby. I just want to make sure this is okay. Is it okay? I mean it takes talent to be able to look at something as reference or concept art and turn it into 3D art.