My sons both have fine motor issues that affected their drawing ability. In his preteen years though, my older son started drawing anime style and got pretty good. My younger son took a Mona Brooks art class when he was five and six, and he drew some really advanced looking stuff. His interest waned though, and he hasn't really gone back to it.
My dd 7 has won awards for her artwork and she draws just about every day. I have pictures of horses and princesses all over my house! She shocked me by drawing a person's face with eyelashes, pupils, and eyebrows at 22 months. She has an eye for detail that is amazing- she adds rings, bracelets, distinctive cuffs and ruffles, necklines... I am really curious to see what she'll be doing in a few more years.
My youngest is reluctant to draw, though she can do well when she does draw. I think she sees her sister's work and knows she can't compete, and so she just doesn't try.
I do think that the details and not necessarily the execution say something about the intelligence of the artist.
