The light looks a bit flat too - this is one time that a bit of fill-in flash wouldn't hurt - kids move about and at this time of year we'll all be shooting 1/30 at f/2.8 until next May...grumble grumble...
It'll stop the eyes looking so 'dead' and expressionless.
It'll also help focus right in there as with a dedicated flash unit, the flash 'talks' to the camera's AF system and (usually) ensures you're focussed correctly.