Hmmm... interesting.  The topic of your post got me thinking about what I have learned since my first humanoid. Definitely a lot. The most important thing I would say, though, is this: understand that everyone has an opinion and everyone has a technique they prefer and that you should take the opnions that help, use them and be greatful, and respectfully decline the suggestions that for whatever reason do not lead to your own artistic satisfaction because at the end of the day you only have yourself, your choices and your own work to take pride in and be happy with. Not exactly a technical sort of 'what have I learned", but something to consider nonetheless. -Les