If it helps, I can feel like that at times. For me it helps if I just think that I had a bad period of time, and I am sure people will understand, mainly because the community you work so hard for here really likes you! Anyway, who am I to talk...
Don't worry, considering how good you are, just take some time to go out in the world, find something inspiring, and just draw it, but with your own personal touch. Find something that makes you think "I can do better than that", and then make that become a reality.
(part 2 because of comment length restrictions) I suggest you find something organic (like a plant or animal, not your local organic super market), look out a window, find something appealing, and sketch it. Then add something cool to it, and something else make it look nice. If this doesn't help you, I'm sure I think of some better advice for you, to help you get out of your artists block.
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