Some thoughts from someone who is now hungry after looking at this.
Now that you've seen what happens have "spare parts" available.. have that piece of cooked shrimp ready to lay in so you can see it's color. Turn the main course slightly to see that browned pasty. A pat of butter would look better than sour cream, but you might have to soften the edges and melt a bit using a heat source since it would run too fast putting it on the hot food. I was guessing what the potatoes were until I read your explanation, perhaps turned a bit so you see some of the skins. There's something off about the asparagus sticking out into space, shorten the stalks a a bit perhaps? Brush the carrots with melted butter or oil so they don't look dry.
Consider setting up and practicing with the studio lights, you will see other things that show up that don't with what you are doing now.