I don't mean to discourage you but I've been growing bonsai for over 30 years and i still have very few(read one or two) trees that I'm satisfied with.
I have many trees and sometimes I just look at them and have no idea how to improve them...and the worst part is that the better they start to look....the more critical i become
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If it were easy,we'd all be "masters".....but it's just so damn much fun anyway
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andy