@molotschna - you can make your critique group in the Social Groups section:
All Pentax User Groups - PentaxForums.com
This will give your group a way for you and your group to communicate back and fourth between each other. From there you and your group can either post the photos within the group thread or post them publicly in the Photo Critique Forum.
I would post the photo in the Photo Critique Forum (this will give you the added benefit of random users to critique) and then post a thread to the group linking back to the photo thread ->
[Group Post]
Hi guys, I just posted a photo for an in depth analyses, here is the photo to critique:
https://www.pentaxforums.com/forums/photo-critique/183240-people-bokehrama-test.html
[Group Post]