Hello Dribbble, I'm Zak!

Hello dribbblers!
I'm Zak Grove—It's exciting to finally join this community. I've been a drib-lurker for at least 2 years, and I’m glad I finally spent some time...

I just posted my debut shot on Dribbble today—and I'm a little bit underwhelmed. I was hoping for more feedback/critiques, but after reading around some forums and Designer News I learned that was a naive assumption. (The comments on Designer News pointed me here, so I thought I'd give it a shot!)

My startup is pre-launch right now, and we're getting ready to hand-off some screens to our front-end developers—I'm hoping to reduce as many needless iterations as possible.

Specifically: Do the screens make sense to you? (Are there any blatant UX mistakes?)

Generally: Any other design nitpicks?