What's the activity level for Members, 60 or 70 ? Both of the numbers have been mentioned in this thread.

Minimum activity to become member is 60. In fact, activity is multiplied by 2 every time : 30 - 60 - 120 - 240 - 480 - then Legendary.

Jr.member or member can post image ?

Yes but newbies that bought the copper member can also. For more information take a look here https://bitcointalk.org/index.php?topic=703657.0

Quote

Q: I can't post / embed an image and I'm a newbie. Why?
A: Embedded images have been disabled for newbies due to abuse (see https://bitcointalk.org/index.php?topic=1172918.0). You'll be able to post images when you become Jr. Member or if you pay a small fee. See more: https://bitcointalk.org/index.php?topic=2385104.0.