Hey everybody! ^.^
I know this is an SL tutorial, not IMVU.. but the methods for creating creases and shadows are exactly the same on IMVU UV maps as well.. i found it very helpful when I was learning creasing.
There isn't any voice instruction in it but I think the tools can be understood very easily without that as well. If you still have any questions, feel free to ask me. I'll be glad to help around

[video]http://www.youtube.com/watch?v=bBOiPspH6vs&feature=related[/video]