All people who draw start out with derivative, badly drawn crap. I see no problem in it being accessible, it's a useful reminder of how much you've progressed. It's not like this stuff is in your face anyway, you have to dig for it, even if it's online
In my case it was never online, but instead I had some of my badly drawn crap published in print. Same end result, really
When I kept specific images under wraps it was due to content: the whiny emo crap that you draw when you have your mandatory whiny emo teen period. It's not that I felt ashamed of it, more like it was nobody else's business? I agree that all teens are idiots, but no one's an idiot 24/7 and even teens usually have a sense of propriety
I don't even know where I'm going with this, I'm sleep deprived