See this post for more details, but here's a small snipit:

achouse wrote:
What is a valid remix?

When deciding if something is or isn’t a valid remix, we consider if the changes made added something new to the project and were not clearly made to get around our guidelines on remixing. If someone has done something like only changing the title of a project, deleting the original creator’s username from the title page, or scribbling on top of someone else’s art, that is not considered valid. But if they did something like changing the sprite in a platformer or creating a new background for a pong game, that is a valid remix.

Are recolors or traced art considered valid remixes?

Yes. By recoloring the art from another project or tracing art, Scratchers have made a change to the project, so recolors and traced art are valid remixes as long as credit is provided to the original creator.