FOSS gamedev and creative worlds

I'd like to see if I could get some of my Natural Beauty textures into the Minetest_game. If I want to at least submit them for approval, what is the best way for me to do pull requests to at least have a chance of having some of them pulled in? Should I submit them individually so they can get accepted or rejected individually or should I submit them all in one pull request?

I would make groups: ores, trees, dirt.

I suggest you submit in one pull request, but keep groups in separate commits. That way they can cherry pick.