I'd like to say that I am happy with the feedback from you all

Do you mean that the current thumbnail should be smaller than the rest?

A few other points:
* Hiding zoombar initially: That is doable (1 line change). I will do that.

* swiping/flicking between pictures:
- Horizontal flicking seems more logical but there are 2 issues: If you flick too far then you have to flick all the way back to viewfinder. The other issue is I can always make the viewfinder the beginning of the list but then settings have to be moved somewhere else.

What I mean is I can easily inject an item in addition to the list of imaes. That Item will be the viewfinder which means we need to find a place for settings.

- Vertical flicking and zooming:
That is the problem I am trying to tackle now but it seems that we either allow flicking or allow zooming. I am still unable to make both work correctly. It's the same for zooming with pinch gesture or volume keys.