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2013 4_fingers anthro anus backsack bad_dragon balls biceps biped black_body black_scales butt claws countershade_genitalia countershade_penis countershade_tail countershade_torso countershading dragon duke_(bad_dragon)erection fingers genitals grey_body hand_on_hip hi_res horn low-angle_view male muscular muscular_anthro muscular_male mythological_creature mythological_scalie mythology narse non-mammal_balls nude official_art penis perineum pose presenting presenting_anus presenting_hindquarters red_balls red_body red_countershading red_penis red_perineum scales scalie solo spread_anus spread_butt spread_legs spreading standing tail vein worm's-eye_view