You'll need a fixative for most traditional media artworks. I use hairspray on stuff if I'm being cheap, but for important stuff and class related things, I use Krylon's Crystal Clear. It holds just about everything (pencil, charcoal, pastel, etc.).
I used airspray 8 years ago, and now on around 50 pencil drawings, the paper has gotten old, but still okay... May be because the paper rarely saw sunlight (sticked in a huuuge album) . Might depend on which airspray you use... I used my mother's loreal one hee...or maybe depends on the paper. And Yellow is not such a bad color. I prefer drawing on creamy paper than on full white ones . damn, I miss pencil drawing. *will do some tomorrow*