Seems fine, with one exception--since some of your textures are edits of textures from Minetest Game, they must adhere to the original CC BY-SA license. Thankfully, this is not hard! CC BY-SA requires that you keep the same license on edits as the originals and give proper credit, but that's pretty much it. You can find a simple explanation here.
You have multiple options:
The easiest solution is probably just to set the media license to CC BY-SA and credit them in a license file, though if you've edited any textures with different licensing (anything from MTG should be fine, other mods will depend on their media license. You can check on their CDB page), this may not be an option.
You could license just the MTG textures under CC BY-SA, and explain which in a license file attached to your mod. Distributing a copy of the licensing info with the mod is considered good practice, so I'd consider doing it either way.
Alternatively, drawing new textures and keeping your current license will also work.
Anyway, just reply once you've handled this and I'll approve the package.
Almost there, just one last step. You still need to list the original source of the textures somewhere, such as a README.txt or LICENSE.txt file in your package. You can see a long example of that in Minetest Game's default mod here, but basically you just need to state who the textures originally came from (and list yourself too since you worked on them).