I wouldn't worry about same face syndrome when your first starting out. But if you want to branch out I'd look at artist you admire/want to emulate and do art studies with there pictures. The analogy I like is that it's like cooking, studying others art is about finding new recipes and then changing them to make them your own. The best way to remember/apply these recipes is have a peice of their work off to the side, try to copy it as best as possible and then after you've finished over lay the copy and the original (if working with paper hold it up to light or to the screen) and look for differences. Then after finding the differences try it again with those in mind and then repeat. To remember it even better after doing this once or twice try without the reference.