A Bug's Life

I've started watching Angel Season 4 at last (moved house and tv provider when it was first broadcast, and never quite caught up. The old house had S3 on terrestrial, the new house had S5 on satellite, and I'm an order freak).

It's quite fun; episodes 1-4 have had some nice moments ( mildest of spoilers )

I put the disk back in its sleeve, and see there is a picture of Angel on it, looking a bit moody. I turn to the next disk - another picture. Hang on, isn't it the same one? No, it's printed higher up, and he's turned a bit more to the left. Disk 3 - ah, this is the same as Disk 1. Are they alternating the pictures? Oh, no it's not the same. And if I look Really Closely at sleeves 1-6 I can see that there are six different pictures of Angel, expressing a gamut of emotion.
We have The Many Moods of David Boreanaz:
* Mostly Paying Attention
* 10% Distracted
* Slightly Alert
* Trying To Look Interested But A Bit Bored Now
* Mildly Pensive
* Expressionless

And now I look, I see there are smaller photos on the back of each sleeve. At first glance they look different from each other, but are they the same as the ones on the sleeve fronts? Aie! It's too difficult, I shan't go there. Come back Roger Moore and your eyebrow acting, all is forgiven!