At this resolution can't really tell. But I think I noticed that the leave looks sharp enough, so I'm guessing misfocusing. I'm also guessing that the picture was taken on the highest zoom setting (whatever it is on the kit lens... 55mm? 70mm?) and on the largest aperture setting, and if this is true, then it could be either camera shake or focusing on wrong object + shallow depth of field.
Also, it looks like the auto exposure got conned by the scene... looks a little overexposed by at least 1.5 stops.