Oh my gooooooodness I love this! And who says your aren't supposed to use anything you want to in art My only critique would be in needs a couple really light areas, it's overall a little dark. Maybe come back in with a white colored pencil or something and really punch up some of those edges?
I ACTUALLY feel very incompetent at drawing birds, to be completely honest! So I'm kind of touched that they came off that way to you, because I really thought I was bad at drawing them. I need to get better at them because I love birds and I want to be happy with the way I draw them too! xD AND AND... NO... I HAVE NOT! care to tell me about this? :0