To portfolio or not to portfolio

I've always wondered; what constitutes a "portfolio" piece when first building your portfolio?

Is it an image that has to do with current events? Is it a piece that you create in regards to an article you read? Or is it a drawing of a concept that really doesn't have anything to do with a current event?

As an illustrator starting out, it's a tough thing to determine what is a portfolio piece. I guess you just need to trust your instincts, and if it's a great piece in your eyes, then include it.

I plan on posting an image for this post on Friday. It's late as I type this, and I'm sleepy.

Thanks for listening!