Unless you are a genius of an artist, you have to do more then repeating what you already know.
You have to look for new and perhaps better ways to push yourself ^^
Check out this Before & After I made today.
One hand was modeled before, the other after, I saw a great tutorial:
![handcompare.png](http://img31.imageshack.us/img31/4269/handcompare.png)
Video Tutorial:
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