being relatively new, and since no one has written a book about it yet... just a question.
I'm assuming that once someone comments on your sketchbook it's polite to return the comment, yes?
What if that the gap between the levels of skills is so huge that you don't have much more to say than "that's cool/awesome/etc."
Well, wouldn't it be kind of irritating for a beginner to crit your stuff?
And while I'm at it, are there any other unspoken agreements about how to CA?