How should I post modifications of other people's work?
I've been adapting some of the sprites and tiles I've found into the style of my game project, and some of them are SA, so how should I go about posting them? Should I make my own submission here and list them as a collaborator or post the image in the comment section of the original and hope they add it to theirs?
Make your own submission, AND indicate what was changed from the original in the description, and copy their attribution instructions into yours, adding your own name as well.
It's also a good idea to post a comment on their submission, indicating that you have made a derivative and include a link to your submission. :)
--Medicine Storm
Depends on the license, on CC-BY you just have to name the original creator, on CC-BY-SA you have to name the original author and release it again under a similar license and for CC0 you do not even need to do anything of this.
But in all cases you can release it as your own work you do not have to worry, thats what open source licenses are for.
Listing as collaborator is not for that, it is if you work on a thing with multiple people and when you make a derivative, the original author usually has nothing to do with it, therefore is not a collaborator.