autumn chestnuts in green spiky shells, perfect for fall-themed s, harvest festival promotions, or healthy snack packaging

hand drawn garden flat agriculture chestnut nut food brown spiky autumn shell seed green snack nature seasonal fall tree nutty natural spiked delicious flavor drawing harvest cartoon organic botanical fruit forest isolated fresh foliage woodland prickly edible autumnal spines crunchy ripe outdoor graphic roasted rustic healthy sketch earthy protein leaf chestnuts shells perfect fall-themed designs festival promotions packaging packaging