Ok great
Just one thing. I'm not master at giving constructive criticism. I've barely learnt how to give decent review for ff's and I'm not used to judge icons just yet. But I can try.
And I do this for the first time in thread. So no offence, I'm probie
AND I'm on very budget-like cell phone's web so it doesn't giving best quality of viewing icons
60's:
Best: 03
Least: 01 (Coloring. I don't know. Too much blue maybe)
70's:
Best: 03
Least: 01 (Background seems little too white/bright)
80's:
Best: 03
Least: 02 (Text coloring I'd liked little different)
90's:
Best: 01
Least: 02 (Something about the background. Or maybe I just didn't like the guy)
2000's:
Best: 01
Least: 02 (That white side part kinda jumps out a bit)
^Ok. Here it is. Best reasoning I could muster. It's not that easy to tell exactly what you didn't like.