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Don't worry about it, everyone starts off somewhere. Hell, I've been taking my art seriously since 2008, and have improved my skill tremendously, but it doesn't just happen overnight and it takes hundreds to thousands and tens of thousands of hours of practice to even come close to being a 'master' of the craft. (I sure as hell have a long ways to go still)

Also, don't call it 'criticism' call it 'critique' ;)