Try this discussion -
http://cakecentral.com/cake-decorating-ftopic-672099-0-days0-orderasc-.html
Look up aine2. She is the best at making people!
in the other forum rylay posted links to a bunch of different sites might wanna check it out
I agree. Aine2 (Lorraine McKay) is amazing. Here's a link to her blog.
http://www.extra-icing.blogspot.com/
edited to add: I just looked at your pictures! Your cakes are great. I think you will have no problem at all modeling fondant figures!
Youtube has some tutorials, and a posted above Rylan posted an entire forum with a BUNCH of tutorials!!
http://cakecentral.com/cake-decorating-ftopic-672099-0-days0-orderasc-.html
If you like books, there's always those by Debbie Brown, Massie Parrish, and Lindy Smith, to name a few (check w/your library, they might carry some by these authors). And then there's "Annie Lang's Polymer Clay Characters" by Stacey Morgan -- just swap gumpaste/fondant for the polymer clay. There are other polymer clay books, too - - just do a google search. 
HTH
This thread has lots of links to modelling info:
http://cakecentral.com/modules.php?name=Forums&file=viewtopic&t=672099&postdays=0&postorder=asc&&start=0
But, I agree with the above posters - get Aine2's tutorials. They are fantastic - and worth every single penny!
We too have purchased a bunch of polymer clay books that helped a bunch! Modeling chocolate works well for figures like that IMO.
Tobias
Yes I agree Aine2 youtube video are very good, but also I like the book How to Make Clay Characters by Maureen Carlson. It goes over facial features, hair, hands, clothing and body preportions.
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