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Your thumb looks like it's coming out of the center hemisphere of the index finger, maybe that's why. You should probably make it slightly bigger, and not in a wrong place. Look at your hand the thumb starts at the top of the side of the index (the top in that pic), that's why it looks like dick. Also, the thumbprint should be facing more away from the palm. I'm not an artist, but this is obvious just by comparing your pic with my hand.