This looks like a pretty good start! I’ve gone ahead and answered some of your questions below:
Smooth scrolling links and buttons can be achieved with just a bit of code. Check out this short article which explains how to achieve the exact effect you’re looking for: http://support.unbounce.com/entries/2…
This is more of a personal preference, but it would be interesting to A/B test having your photo versus not.
Unbounce pages are not currently mobile responsive, but we do have a work around that will allow for you to create a good mobile experience for you mobile visitors. This is a work around that involves creating 2 versions of your page one for desktop and one for mobile.
To create the mobile version of your page, you can either start with a ready-made mobile template (scroll down: http://unbounce.com/landing-page-temp…), or create your own with a recommended width of 320px.
Then, simply implement this mobile redirection script here:
Hope this helps, Masten!