some people might not know how to add a source since tumblr has hidden it, but i might start doing this
click the little gear and add your url, now when someone reblogs your art it’ll look like this
sure it can still be deleted but it’s a bit more labor intensive and people might not know how to do it, not notice it’s there, not care because it doesn’t interfere with “aesthetic”, and/or be too lazy to do it- so there’s still a link to your work if they delete the comments
FEEL FREE to source any art you see unsourced, too!