Add a realistic shadow under the Bigfoot footprint, keeping the playful look of the original 3D emoji style. The image should have no background. Maintain the 3D emoji style's characteristics in the edit. image

vertical mobile story visual for Decathlon, modern interface, slogan 'Mon équipement, mon impact' at the top, selection of eco-responsible sports clothing with realistic photos, pictograms of recycling and carbon footprint, highlight #Ecomax15, natural palette (soft greens, beige, white, light blue), dynamic universe emoji