It looks fine, although not perfect.
First of all, due to a shallow depth of field some areas are out of focus. Secondly, since it was taken at 1/50 s, there is a chance of slight motion blur. Thirdly, 17-40 is not the sharpest at f/4. Fourthly, there is a chance of mirror shake at such shutter speeds. Lastly, noise reduction algorithms soften the image.
I would retake that picture using:
- A solid tripod and a cable release (that solves the motion blur problem)
- ISO 100 (eliminates softening due to noise reduction)
- f/8 (solves the DOF problem and reduces lens aberrations)
- that puts shutter speed in 1 s range (eliminates the effect of mirror shake as well).
Long exposures are fine for static objects. Teddy bear is not going to blink or move, you know.