First time trying something like this. Obviously the slower shutter speed caught the minute movement of the cereal as the milk hit, causing some blurriness. Next time I'll setup a light or raise the ISO a bit. The lens is pretty slow (4+) at that magnification.
I shouldn't watch food photos just before dinner. Makes me hungry. I like the milk streaming into it and the yellow and brown colors. Just one suggestion: it looks a little dark, perhaps you can brighten it somewhat to make it more sparkling.