Why this card is awesome: Because of the totally wacky pose. It's like the photographer told him to start his windup, even though he's clearly not on the mound and (hopefully) not going to fire the ball.
I also love the very casual spring training shot with players warming up. And, there's something very unusual for a baseball card, which is a wheelchair behind Hershiser on the right. I can't tell if the person in the yellow shirt is in the wheelchair or behind it, but nevertheless it's quite unusual to see.
By the way, this card (as you can see from the title) is from the 2004 fan favorite set, not the 2003 set as with the Puckett and Lyons cards we've already seen. If you compare it to
Hershiser's regular card, you'll see that the wording for both the team name and Hershiser's name is a bit narrower on the 2004 card.