Being considered good looking is highly subjective, although I agree that there are some universal standards of attractiveness.
What most guys don't understand is, that women generally don't expect as much as men physically. Now, don't get me wrong, there are some nasty, fat, ugly bytches who think they deserve to be with male models, but generally women understand men don't wear makeup, or color their hair that often. Therefore, they expect a little less.
1) HYGIENE-This is the most important part of attractiveness. This includes clean, straight teeth, no body odor, nice cologne, shower daily.
2) Maintaining the proper weight for your height. Now there are women who prefer overly muscular guys(like me), but honestly I think most women prefer a medium build that's toned and muscular.
3) Dress well. Everybody has their own style, but making sure your clothes are clean and wrinkle free goes a long way. Try to stay with contemporary styles, and WEAR CLEAN, NICE SHOES!!!!
4) Be articulate and ambitious. These are not physical attributes, but you'd be surprised how quick you can blow it if you come across as a no talent dumb ass. Women truly appreciate intelligence and ambition.