Enzie, I really have general advice more than what you should do in this painting.
If everything is bright and full-strength color, nothing stands out. If your goal was to show the light on the bright colored vegetables and have it look like light, you need dark areas near it to show the light. Without shadow there is no light. Without light you have no form. And too much light kills the form and the effect of the light as well. Not that you do not have light and dark areas, but if you have light shining on a bunch of fruit they cast shadows on other things, and things not in the picture cast shadows on areas of the fruit. And the bunch of fruit as a whole has a light and a dark side.
If you try to put all of it in the light, you get nothing but the appearance of local color, not the color in light and dark and from. Also, to have depth, you must have form. Although you have given form to each individual vegetable you have little form on the bunch.
The bunch should have a light and a dark side. Like a tree painted with each leaf having detail, you must also paint the tree as a whole or it is flat.
In my small modification, I did not really take the time to be accurate to any light source; I was just trying to give an idea of what I meant.
But as you look at the pumpkins in your painting, they do not have much shape as a whole. By showing the shadows of one on the other, and then having a distinct light and dark side, you give them form, and put them in space. The reason your figure seems to sit in the same space as the background is because the background seems flat as well. And that is because the light source you have is not casting shadows that give form. Without form, there is no depth.
|