I usually have a hard time taking pictures of lighter things. What happened here sometimes happens to me - the flash killed the detail and texture of the popcorn.
Strong focus on the popcorn but it's a bit too static and ordinary. Perhaps shooting from underneath the popcorn, say under a glass table and showing a hand reaching for it would have upped the wow factor. Also, watch your exposure. The highlights are a bit too bright. I might try diffusing the light more so it's not so harsh.
If it weren't for the shadow in the upper right, the blownhighlights wouldn't bother me. It would almost give it a certain "tone" or mood. However, the shadow makes it look unintentional.
This shot doesn't seem like a lot of thought went into it. It is a little too busy for me, and I think that you should have all the kernels in focus. The shadow is also distracting. This shot is just really bland.