Well, the bad news is that this is nowhere near the quality you want to put in a portfolio. It's not game-art right now, the render is a bit lousy and default-materialish, and the model lacks detail, interest, and functionality. I would really recommend searching the forums for others who have worked on bikes and cycles, looking at their process, how they use reference, and how their topology is laid out. The most obvious problem with the bike right now is that it seems you're making it up out of your head, which is a big no-no. Use concept art, or photo-reference for everything, especially at this stage in your modeling development.
The good news is that if this is truly your first semester, then you're off to a really great start, better than I was in modeling one. I think what you'll find is that the amount you'll advance in the next year or two, you won't want to keep this in your portfolio. Watch every modeling tutorial you can get your hands on, the internet is chock-full of them. I would start with polycounts wiki, and cg.tutsplus.com. Study how the pros do things, and what their techniques are, and I think you'll be surprised by how quickly you improve. I hope this is constructive for ya.
Good luck! And Happy Easter!