The design and layout is looking good. Some feedback from my end.

• Upvote icon looks similar to 'like' of facebook, could be avoided.
• In Moderators screen, use different badge color for 'moderator', 'supermoderator etc.
• 'Contribution Flow' doesn't show the guideline before posting, guideline are helpful for people so that they don't select wrong category and then get burned.
• In 'Contribution Flow', 'See All' button is supposed to be 'Submit' ?