"Create a pixel art sprite sheet of a young male character walking animation. STRICT REQUIREMENTS: - 16 unique frames (NO duplicates) - arranged in a perfect 4x4 grid - each frame shows a clear progression of a walking cycle (left to right movement) - every frame must be slightly different to create a smooth animation loop - the animation must seamlessly loop from frame 16 back to frame 1 CHARACTER: - young male with brown messy hair - wearing a brown trench coat, red-brown vest, dark pants, brown shoes - side view (facing right) ANIMATION DETAILS: - natural walking cycle (legs and arms swinging opposite) - coat must move slightly in each frame (dragging behind, reacting to motion) - head and body slightly bobbing up and down during walk FACE: - frames 1–5: neutral expression - frames 6–16: slightly exhausted, subtle breathing expression STYLE: - clean pixel art - consistent proportions in every frame (no size shifting) - no motion blur - no frame should look identical TECHNICAL: - transparent background (NO background at all) - each frame clearly separated with spacing for easy cutting - centered character in every frame - same size and alignment in all frames IMPORTANT: This must look like a real game-ready walking animation when frames are played in order."