Nice little set - I like that bowie knife and the funky glass.
Would it be possible for you to put this under a standard license? Your terms seem pretty similar to CC-BY, which is the standard 'use however you want (commercially, noncommercially, whatever), but you have to credit me' license ( https://creativecommons.org/licenses/by/4.0/ ).
I'm always looking for more well-done map clutter, but with so many nice sprites it gets hard to track how to credit things that aren't standard.