To post a picture, you have to upload it to some site, such as photobucket. Then hit the image button and paste the url into the box that appears. As for my best picture, it would have to be this picture of a cardinal a year ago. I don't have it anymore, though, so I can't upload it. And it wasn't very good anyways, I'm not much of an artist.
I'd have to say, the two pieces I am proudest of are: Sunrise and You stand no chance First is 100% traditional art, second 100% digital. Both already posted elsewhere in these forums, but what the heck. I could tell why these two are the "best" in my opinion, but I don't know if anyone cares.