I know Asians who also sometimes can't tell the difference just from a picture. From speaking and mannerisms, yes, but acting can overcome these.
Anyway, take the test yourself and see how well you do. I got half right, which isn't too bad
http://www.alllooksame.com/
I did okay, but...that test was difficult...I guessed the Japanese and Koreans better, but had difficulty with the Chinese.
My report card score was "very bad". I got 7 correct. It said, "Obviously you can't tell them apart." LOL.
To be honest, I wouldn't have even known a couple of the people in those photos were Asian at all.
Now I want to see a test that asks Asians to tell apart different Europeans... lol. :-)
I guess they DO all look alike!