Trying to sculpt from memory alone is difficult at best, and practically impossible if your skill level is below "expert." Maybe your ego won’t let you "cheat" by looking at photos that represent portions of what you are going to create, but I don’t know an artist worth his or her salt who doesn’t maintain a "morgue" filled to overflowing with images of all sorts—eyes, ears, noses, lips, hands, teeth, wrinkles, scars, scabs, pimples, cleft chins, turkey necks, age spots, pores, moles, and so on. You name it. In the digital age, I suppose those magazine pages are supplemented with Googled pictures downloaded from the Internet. "Ask and ye shall receive!" It all depends on what you need to augment your memory and make your design interesting and appropriate for the character.
If you have a digital camera, you might even want to go out on your own in search of interesting faces and bodies to add to your reference library, if you aren’t already doing just that. Be sure to be polite when asking if you can take someone’s photograph; don’t approach someone with a wonderfully weathered face full of character and say, "Ma’am, I’ve never seen wrinkles like that except on an elephant!" and expect to get a favorable response. But to be on the safe side, have a supply of photo releases at the ready, or snap unobtrusively and discretely from afar with a telephoto lens if your people skills need work. But as a makeup effects artist, I certainly hope that isn’t the case!