I don't mean thoughtful as in polite, I mean full of thought. And this blue jay does seem to be thinking of something, perhaps our rule that it's better to have a good picture of common wildlife than a bad picture of something rare. Sure, that's exactly what he's thinking about. But this image is another good example of that rule in my book.
Interestingly, blue jays are known to mimic the cries of hawks and I actually heard this jay do a perfect (and I mean perfect) imitation of a red-tailed hawk. Why jays do this isn't known exactly. I'll tell you though, the impression was good enough to fool anyone.