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So, this is one of my first digital 2d works. It's actually a repaint of a sculpted head. Didn't know where to post it since there is as well some 3d. Hope it's not the wrong place. Comments and critiques are welcome.
It looks muddy, but the kind where you worked too close to the canvas. Also the values are a bit random, but mostly the structure is very 'dirty'. Get some large hard brushes at first, and focus on building structure.