Thanks for the kind words everyone!
Right now I would say: Not at all. I'm pretty sure that I could learn how to make such textures but at the moment I lack both the skill and the tools for it.
All of those wallpapers are actually rendered in Full HD but I only ever posted lower res versions here and completely forgot that you cannot simply click it to get to the full version on imgur. In any case, I'll release them all in an archive once I'm done. But for now, here's Kashyyyk: https://imgur.com/blupSB5
Thanks for that link. Very interesting to read and it might have helped with some issues I had if I had seen that about three years ago. But I think I managed to work around that pretty well so I guess I'll stick with my current method xD