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1:1 2017 absurd_res anthro anus back_muscles backsack balls biceps biped black_background blue_eyes butt crouching digital_media_(artwork)equid equine full-length_portrait genitals grass greyscale hi_res hooves horse looking_at_viewer looking_back male mammal mane monochrome muscular muscular_anthro muscular_male nude perineum plant portrait rear_view riche signature simple_background solo spot_color underhoof venlightchaser