Should I submit an arts supplement?

Hey guys.
So some of the unis I’m applying to have said I can submit an optional arts supplement.
Now, I do have graphic design skills and am actually working as a graphics designer at a NGO. I mostly make posters and stuff, nothing THAT artsy.
Also, I have written done some pretty good creative writing. Nothing published tho.
So should I submit an arts supplement for these?

If it is at or near the quality you’d submit to an art school, submit. If not, don’t.

If unsure of the quality level, ask an art teacher for critique.