What wonderful pictures!! The first 4 ones are "out of this world"! You really captured their expression well!

Concerning grainy pictures, all I remember about that is, that with a 35mm film, a 27 would be grainier than a 22, meaning that the film you use for bad lighting will always be grainier than one for good lighting. When it comes to digital, I'm not sure how it works.

Sorry for not being able to exlain it very well, but you probably need to change the settings in your camera.