Welcome to the Watercolor Forum!
Your painting is looking very nice so far. There is a strong sense of light entering from the upper left. That would definitely give you the opening to add a bit more depth to the background on the right side of the painting and under the table.
I can see a mix of colors in the black which is good. Maybe another glaze with those same colors????
I think the dark shadow on the side of the vase is a bit confusing because it is so dark on the top part and then paler at the bottom. The shadows on the apples should have some of the red body color showing through IMHO.
I've moved your thread to The Studio because that is where we come for help such as you are asking about. The Gallery is where we put our finished works.