I like the lighting on the drink and the cup but not so much on the berry's. There are some berry colored spots in the black of the background. I don't know if they are editing remnants or sensor dust or something else but they are just slightly distracting. Not too bad though since at least they are in the same color as the drink.
I do love a blackberry smoothie and this one looks yummy. The presentation photographically speaking is a bit rough. I figure those are blackberries in the background but they don't stand out well. Cleaning up the plate from the berry juice would have been a good call as well.
Very beautiful, making a summer drink elegant. I love the contrast with black and white background, and the black berried added at the top as well as side of the drink. The curvy reflection on the glass is quite artsy, and I love how there's berry juice on the bottom right side... which makes it real.
This would be excellent if you cropped to remove the pile of blackberries and shadows at the base. I really like the top three quarters of the picture.