REALLY good at drawing people's stuff can mean two things. One, you can copy a picture onto another by hand just looking at it or two, you can really draw whatever you want, but you just can't make up clothes, faces and hair. If one, you are one of the many people who believe they are really good at drawing, but ignorant to the fact that a 10 year old can accomplish if he's enough of a perfectionist(I drew a picture of Samus, folds in her armor, and gun details and all) and that its really easy for a lot of people.
Sorry, I'm a bit harsh on people like that, but this one guy was like that and full of himself, and it turned out he sucked when drawing on his own. However, if you're type number two, then congrats. It really means taking inspirations from designs you like, and coming up with something new. There are a lot of people that you can study from like places in deviant art.
ex: osy057.deviantart.com
ps: I'm not allowed to post links yet, so I left the www part off.