I am trying to take pictures of my son (2.5yrs) and my other family members. They come out pretty well and sharp but when I see the portraits posted on Flickr and other sites, I have noticed that many of them have extremely sharp eyes. The eyes are the highlight of those pictures.. even in the kids pictures. I am never able to take pictures with eyes so extremely sharp.

Are they doing something different in the pictures or may be post processing? Not sure. I would love to know how to do that. 

I have Canon 350D with 50mm 1.8 II lens. I also have Canon 100mm 2.8 macro.