First off, Kudos to Xenforo Media Gallery 2.0.
The default Look is much better than 1.0.
The focus on the images vs the stats of the images is great.
But that lonely Navigation hamburger with the huuuuuge amount of greyspace around it looks awkward.
I believe the purpose of a menu is to give access to additional items but not take up alot of space. In this case, the menu takes up so much space, you could list the items of the menu in the space the menu takes up.