I have been thinking about how to show the reflection of light since sketching snowscapes two weeks ago and especially since sketching a puddle from some minor flooding last week. This morning the light came in the window and through a wine bottle that we were using for a vase. The polished table also reflected light and altogether it was an excellent opportunity to try to understand the look of luminance. What I know so far is that the contrast between light and dark tones, and between clear and blurry color matters. If I were to redo this sketch I would consider including elements such as the window frame and the wall around the window just to add a non-reflective contrast to the light.
I used marker and watercolor and then later scanned the sketch into Procreate where I developed the background and blurred the light coming through the bottle and from the table.