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Well, I think part of it, too is just not caring if you're caught. In fact one person I drew came up behind me and said they enjoyed the drawing I did of them and wanted to get it printed. It's not so bad being caught (just make sure the drawing isn't awful haha)

That's probably my main issue at the moment then... I prefer drawing landscapes over people and I've never had a tree object to what I've drawn. :-)