Shading, correct antomy, etc. They know the strutcture of an animal or human and they've been practicing for years. Also, many of them are older than you.
I am basically quitting Chicken Smoothie. I don't have as much time as I'd like to get online, so I am giving up all of my CS pets for artwork of my characters\fursonas. I'm also done participating in all of my roleplays. I have two Jelly Bean Dragons, a species made by Hiccup, and I'm trying out for an baby inverted Dox Dragon, by Teleport. To participate in my character drawing contest with amazing Very Rare prizes from '08 and '09 click here. These are my JBDs, Apples and Starburst.