Hi!
There are a few things which could help improving your product shot in my opinion.
First off the material of the box is hard to read. I assume its made of metal or plastic. In both cases
the refletions are too diffuse (the foil on the chocolate bits is way better). Also try using an HDR image or several area lights from different directions to give it less flat and more realistic reflections. If the box is made of paper try using a normal map giving the surface some strucure.
Concerning the composition I think the chocolate bits could be positioned better. Try using a wider focal length and place them a little closer to the camera to make them look bigger.
If you look at the reference picture Soul_Gatherer has posted, you see how the nuts and the chocolate bits are scaled unrealisticly big compared to the glass in the background. That’s quite common in food product shots as the ingredients are supposed to catch your eye.
Also the part of the table’s edge which is in focus (and very bright) is positioned directly next to the chocolate bits which drives away your eye from the product. I’d recommend positioning the table differently so that only the blurry front edge is within the framing as the table itself has no importance for the produc shot.
If you run into troubles with the marble color appearing wrong when using warmer lights try rendering it on a seperate render layer and adjusting the colors in post.
Hope I wasn’t too nitpicky 