Just looking at this picture makes me want to have some of this drink. I really love the candle blur on one side of the picture, and the hand in the background. That adds a really cozy "coffee-shop" effect to the picture. Also, great job focusing in on the whipped topping and powder. The detail there combined with the bubbles in the glass are a great combination and make the drink look pretty.
Okay, so right off the bat I can tell you that the spoon and the straw is really distracting. The drink is positioned in a way so that the spoon and straw intersect in the image. I would suggest next time shooting the picture from another angle (maybe spinning the cup around) so we get a clear view of both the spoon and straw separated. Also, I would recommend showing a little more of the glass. The picture cuts off about halfway down. It would add a little more of an impact on viewers to see some more of the glass.
Great job overall! You've got a lovely photograph here and I hope you continue to take such creative photos.