Where did you create it?
Did you use the Metahuman Creator inside Unreal Engine 5.6?
Did you then use the assemble button at the end of Metahuman Creator?
It should provide you with a Metahuman that is exactly as you designed it.
Also, I’d suggest to use the 8k textures.
As for the rest, its most likely coming down to missing settings.
You want to set the LOD mode inside the Metahuman BP to LOD 0 instead of -1.
-1 means automatic, 0 means force LOD 0.
You also want to go into project settings and disable Auto Hair LOD mode. Otherwise your Hair will suffer from LODs.
To get the textures to look exactly like inside Metahuman Creator, you need to adjust your texture and material settings. I suggest to look into Texture Streaming for that.
Also set your Viewport to Cinematic and your Material to Epic.