As said above, critique (but not too critically) the previous poster's avatar as if they're a work of art.
I specify "previous two", so to insure that no-one gets skipped. Obviously the first poster doesn't need to critique the previous two posters' avatars as there aren't two previous posters. The first two posters can skip me if they so wish (unless they're feeling particularly brave). Hell, if you want you can critique all the previous posters' avatars.
It goes without saying that you're free to critique it in any manner you wish. For example you can critique it as if abstract, surrealist, modern or impressionist art etc.
TL;DR: critique the previous two poster's avatars in any way you want.
I specify "previous two", so to insure that no-one gets skipped. Obviously the first poster doesn't need to critique the previous two posters' avatars as there aren't two previous posters. The first two posters can skip me if they so wish (unless they're feeling particularly brave). Hell, if you want you can critique all the previous posters' avatars.
It goes without saying that you're free to critique it in any manner you wish. For example you can critique it as if abstract, surrealist, modern or impressionist art etc.
TL;DR: critique the previous two poster's avatars in any way you want.