Here, the projected shadow of the tulip's stem follow the surface of the water to climb the side of the bucket.

Here, the subtil changes of color where the stem is in or out of the water. The textured pigments used for the bucket and the white fine lines to accentuate the reflection of light on the water.

Here, the shadow is more precise and darker near the bucket. The colors get lighter and less precise as you get farther from the subject. Notice the different hues representing the different subjects.