Right now, I’m having problems with the image texture of the left half. I already tried everything imaginable, but the texture doesn’t show up the way it should. What I’m getting is this:
The texture isn’t scaled properly, and in addition it’s mirrored. Where do I find an option to mirror it horizontally? Plus, the white in the texture appears grey.
With no file it’s hard to guess what you’re trying to achieve, and how you’re attempting to do it.
Rotation of 2D (xy or uv) coordinates; mapping node with z rotation.
Skewing of 2D coordinates; separate xyc, x=x, y=y+(n*x), combine xyz.
Mirroring of 2D coordinates; mapping node with scale -1 in the direction you want to mirror.
Flip&mirror, a bit more intricate.
Texture still missing. Normals appear to be flipped if that is where your normal camera is.
As you have UV unwrapped it (faces are overlapping though), you have two options:
UV Map -> Mapping Node with -1 in the x scale value.