This is so that people can find this info quickly and easy. I chose not to post fish/insects, villagers etc because I consider those are more spoilers than I would like to give out and they're not hard to find. Here you go and enjoy.
Hair color guide: http://24.media.tumblr.com/tumblr_mebysbPD8c1qdm0y0o1_500.png
Eye color guide: http://24.media.tumblr.com/tumblr_mebyvhK83x1qdm0y0o1_500.png
Face Guide: acwiki3ds.wikispaces.com/Face+Guide
Town Maps: http://s745.photobucket.com/user/the_fishermans_bucket/media/Animal%20crossing%20City%20folk/acnlriverlayoutguide_zps8db75a80.png.html
Note: I can't take credit for non of these (which I could say I knew Japanese and owned a copy =P). For the first 3 here's where I got them: http://www.belltreeforums.com/showthread.php?63659-Hair-Colors-Styles-w-Eye-Colors-Guide-%28with-pics-and-translations!%29