The photos are stunning, and the ken burns work is great but I have a few comments:
I thought that your choice of music was a touch of putting.
4:51mins seems long,especially seeing that when you go full frame it seems pix-elated
have you thought about mixing moving images with the stills, this winter I am practicing with a dolly slide and a 5d mkII
one option for combating this would be to produce a slightly shorter film, sounds silly but there is logic behind it: the larger clip can appear on your computer the longer your attention span is, the smaller the clip can appear the shorter the attention span, if you are relying on you tube then drop it 2 minutes or so, this way people are more likely to stay watching to the end