The stool appears to be lumpy and sausage-shaped, corresponding to Bristol Stool Scale type 2. It has a very dark brown color and visible oil. Consider improving your diet and increasing hydration for better health.

The stool appears watery and has a yellowish color, corresponding to Bristol type 7. Please pay attention to your digestive health and consult a professional if necessary.

The stool appears to be Bristol type 5 with a normal brown color. It's soft and composed of separate blobs, and the volume is small. Consider increasing your fiber intake and staying hydrated.

The watery stool and yellow color are not good signs for your health. This corresponds to Bristol type 7, which is likely diarrhea. Please replenish fluids and seek medical attention if necessary.