What does it mean when your drawing is pinned?

One of mine is and I was just wondering. Probably a dumb question, but oh well! That's what I'm here for.

I think it's just a button you can push in your gallery to make it always appear first; it will always be the "cover shot" for your gallery. You may have pushed it accidentally. I believe there's a button to push to unpin it -- look around.

Ok, I probably did. I'll leave it though, it happens to be my best. lol.