High resolution textures, higher render distance, better LOD quality, reflection and specular light tweaks.
I made a sky recently, but it doesn't fit too well. Even if you won't see it in final version, i wanted to share it.
Also i skip working on new skyboxes until i have a better PC (well, better CPU), because it takes too many times to work on them.
You can support the project on Patreon:
Patreon.com