Objects are easy to find ; in fact, you can photograph anything you want or like.
Once you start working with real models, I just guess you need to be sure your social skills are accurate. It's important you direct the person in front of you in such a way, he or she knows exactly what to do, what pose to strike without looking stilted or artificial.
Smiles aren't neccesary for good images ; they often look foppish and strained.
A good way to get a true radiant smile is to talk while your working, small talk but always ready to hit that button (I always use my burst setting) ; succes guaranteed to get that 1 striking picture.